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Mediterranean Sea

(Redirected from Mediterranean Intermediate Water)
This article is about the sea in Africa, Asia, and Europe. For the term in general, see Mediterranean seas.
"Mediterranean" redirects here. For other uses, see Mediterranean (disambiguation).

The Mediterranean Sea (/ˌmɛdɪtəˈreɪniən/ MED-ih-tə-RAY-nee-ən) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Europe, on the south by North Africa, and on the west almost by the Morocco–Spain border. The Mediterranean has played a central role in the history of Western civilization. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely desiccated over a period of some 600,000 years during the Messinian salinity crisis before being refilled by the Zanclean flood about 5.3 million years ago.

Mediterranean Sea
Map of the Mediterranean Sea
Location
Coordinates35°N 18°E / 35°N 18°E / 35; 18
TypeSea
Primary inflowsGulf of Cádiz, Sea of Marmara, Nile, Ebro, Rhône, Chelif, Po
Primary outflowsStrait of Gibraltar, Dardanelles
Basin countries
Coastal countries:

For other countries, click here.

Surface area2,500,000 km2 (970,000 sq mi)
Average depth1,500 m (4,900 ft)
Max. depth5,109 m (16,762 ft) ±1 m (3 ft)
Water volume3,750,000 km3 (900,000 cu mi)
Residence time80–100 years[1]
Max. temperature28 °C (82 °F)
Min. temperature12 °C (54 °F)
Islands3300+
SettlementsFull list

The Mediterranean Sea covers an area of about 2,500,000 km2 (970,000 sq mi),[2] representing 0.7% of the global ocean surface, but its connection to the Atlantic via the Strait of Gibraltar—the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates the Iberian Peninsula in Europe from Morocco in Africa—is only 14 km (9 mi) wide. The Mediterranean Sea encompasses a vast number of islands, some of them of volcanic origin. The two largest islands, in both area and population, are Sicily and Sardinia.

The Mediterranean Sea has an average depth of 1,500 m (4,900 ft) and the deepest recorded point is 5,109 ± 1 m (16,762 ± 3 ft) in the Calypso Deep in the Ionian Sea. It lies between latitudes 30° and 46° N and longitudes 6° W and 36° E. Its west–east length, from the Strait of Gibraltar to the Gulf of Alexandretta, on the southeastern coast of Turkey, is about 4,000 kilometres (2,500 mi). The north–south length varies greatly between different shorelines and whether only straight routes are considered. Also including longitudinal changes, the shortest shipping route between the multinational Gulf of Trieste and the Libyan coastline of the Gulf of Sidra is about 1,900 kilometres (1,200 mi). The water temperatures are mild in winter and warm in summer and give name to the Mediterranean climate type due to the majority of precipitation falling in the cooler months. Its southern and eastern coastlines are lined with hot deserts not far inland, but the immediate coastline on all sides of the Mediterranean tends to have strong maritime moderation.

The sea was an important route for merchants and travellers of ancient times, facilitating trade and cultural exchange between the peoples of the region. The history of the Mediterranean region is crucial to understanding the origins and development of many modern societies. The Roman Empire maintained nautical hegemony over the sea for centuries and is the only state to have ever controlled all of its coast.

The countries surrounding the Mediterranean and its marginal seas in clockwise order are Spain, France, Monaco, Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Turkey, Syria, Lebanon, Israel, Palestine (Gaza Strip), Egypt, Libya, Tunisia, Algeria, and Morocco; Cyprus and Malta are island countries in the sea. In addition, Northern Cyprus (de facto state) and two overseas territories of the United Kingdom (Akrotiri and Dhekelia, and Gibraltar) also have coastlines along the Mediterranean Sea. The drainage basin encompasses a large number of other countries, the Nile being the longest river ending in the Mediterranean Sea.[3]

Names and etymology

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Wadj-Ur, or Wadj-Wer, ancient Egyptian name of the Mediterranean Sea
 
With its highly indented coastline and large number of islands, Greece has the longest Mediterranean coastline.

The Ancient Egyptians called the Mediterranean Wadj-wr/Wadj-Wer/Wadj-Ur. This term (literally "great green") was the name given by the Ancient Egyptians to the semi-solid, semi-aquatic region characterized by papyrus forests to the north of the cultivated Nile delta, and, by extension, the sea beyond.[4]

The Ancient Greeks called the Mediterranean simply ἡ θάλασσα (hē thálassa; "the Sea") or sometimes ἡ μεγάλη θάλασσα (hē megálē thálassa; "the Great Sea"), ἡ ἡμετέρα θάλασσα (hē hēmetérā thálassa; "Our Sea"), or ἡ θάλασσα ἡ καθ’ ἡμᾶς (hē thálassa hē kath’hēmâs; "the sea around us").

The Romans called it Mare Magnum ("Great Sea") or Mare Internum ("Internal Sea") and, starting with the Roman Empire, Mare Nostrum ("Our Sea"). The term Mare Mediterrāneum appears later: Solinus apparently used this in the 3rd century, but the earliest extant witness to it is in the 6th century,[5] in Isidore of Seville.[6] It means 'in the middle of land, inland' in Latin, a compound of medius ("middle"), terra ("land, earth"), and -āneus ("having the nature of").

The modern Greek name Μεσόγειος Θάλασσα (mesógeios; "inland") is a calque of the Latin name, from μέσος (mésos, "in the middle") and γήινος (gḗinos, "of the earth"), from γῆ (gê, "land, earth"). The original meaning may have been 'the sea in the middle of the earth', rather than 'the sea enclosed by land'.[7][8]

Ancient Iranians called it the "Roman Sea", and in Classical Persian texts, it was called Daryāy-e Rōm (دریای روم), which may be from Middle Persian form, Zrēh ī Hrōm (𐭦𐭫𐭩𐭤 𐭩 𐭤𐭫𐭥𐭬).[9]

The Carthaginians called it the "Syrian Sea". In ancient Syrian texts, Phoenician epics and in the Hebrew Bible, it was primarily known as the "Great Sea", הים הגדול HaYam HaGadol, (Numbers; Book of Joshua; Ezekiel) or simply as "The Sea" (1 Kings). However, it has also been called the "Hinder Sea" because of its location on the west coast of the region of Syria or the Holy Land (and therefore behind a person facing the east), which is sometimes translated as "Western Sea". Another name was the "Sea of the Philistines", (Book of Exodus), from the people inhabiting a large portion of its shores near the Israelites. In Modern Hebrew, it is called הים התיכון HaYam HaTikhon 'the Middle Sea'.[10] In Classic Persian texts was called Daryāy-e Šām (دریای شام) "The Western Sea" or "Syrian Sea".[11]

In Modern Standard Arabic, it is known as al-Baḥr [al-Abyaḍ] al-Mutawassiṭ (البحر [الأبيض] المتوسط) 'the [White] Middle Sea'. In Islamic and older Arabic literature, it was Baḥr al-Rūm (بحر الروم) or al-Baḥr al-Rūmī (بحر الرومي) 'the Sea of the Romans' or 'the Roman Sea' or Baḥr al-šām (بحر الشام) or al-Baḥr al-šāmī (البحر الشامي) ("the Sea of Syria"). At first, that name referred only to the eastern Mediterranean, but the term was later extended to the whole Mediterranean, it was also called Baḥr al-Maghrib (بحر المغرب) ("the Sea of the West").[12][5] A name that was used mainly for the western basin.

In Turkish, it is the Akdeniz 'the White Sea'; in Ottoman, ﺁق دڭيز, which sometimes means only the Aegean Sea.[13] The origin of the name is not clear, as it is not known in earlier Greek, Byzantine or Islamic sources. It may be to contrast with the Black Sea.[12][10][14] In Persian, the name was translated as Baḥr-i Safīd, which was also used in later Ottoman Turkish.[12] Similarly, in 19th century Greek, the name was Άσπρη Θάλασσα (áspri thálassa; "white sea").[15][16]

According to Johann Knobloch, in classical antiquity, cultures in the Levant used colours to refer to the cardinal points: black referred to the north (explaining the name Black Sea), yellow or blue to east, red to south (e.g., the Red Sea) and white to west. That would explain the Bulgarian Byalo More, the Turkish Akdeniz, and the Arab nomenclature described above, lit. "White Sea".[17]

History

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Main article: History of the Mediterranean region

Ancient civilizations

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Greek (red) and Phoenician (yellow) colonies in antiquity c. the 6th century BC
 
  The Roman Empire at its farthest extent in AD 117

Major ancient civilizations were located around the Mediterranean. The sea provided routes for trade, colonization, and war, as well as food (from fishing and the gathering of other seafood) for numerous communities throughout the ages.[18] The earliest advanced civilizations in the Mediterranean were the Egyptians and the Minoans, who traded extensively with each other. Other notable civilizations that appeared somewhat later are the Hittites and other Anatolian peoples, the Phoenicians, and Mycenean Greece. Around 1200 BC the eastern Mediterranean was greatly affected by the Bronze Age Collapse, which resulted in the destruction of many cities and trade routes.

The most notable Mediterranean civilizations in classical antiquity were the Greek city states and the Phoenicians, both of which extensively colonized the coastlines of the Mediterranean.

Darius I of Persia, who conquered Ancient Egypt, built a canal linking the Red Sea to the Nile, and thus the Mediterranean. Darius's canal was wide enough for two triremes to pass each other with oars extended and required four days to traverse.[19]

Following the Punic Wars in the 3rd and 2nd centuries BC, the Roman Republic defeated the Carthaginians to become the preeminent power in the Mediterranean. When Augustus founded the Roman Empire, the Romans referred to the Mediterranean as Mare Nostrum ("Our Sea"). For the next 400 years, the Roman Empire completely controlled the Mediterranean Sea and virtually all its coastal regions from Gibraltar to the Levant, being the only state in history to ever do so, being given the nickname "Roman Lake".

Middle Ages and empires

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The Western Roman Empire collapsed around 476 AD. The east was again dominant as Roman power lived on in the Byzantine Empire formed in the 4th century from the eastern half of the Roman Empire. Though the Eastern Roman Empire would continue to hold almost all of the Mediterranean, another power arose in the 7th century, and with it the religion of Islam, which soon swept across from the east; at its greatest extent, the Arabs, under the Umayyads, controlled most of the Mediterranean region and left a lasting footprint on its eastern and southern shores.

A variety of foodstuffs, spices and crops were introduced to the western Mediterranean's Spain and Sicily during Arab rule, via the commercial networks of the Islamic world. These include sugarcane,[20] rice,[21] cotton, alfalfa, oranges,[22] lemons,[23] apricots,[24]spinach,[25] eggplants,[26] carrots,[27] saffron[28] and bananas.[29] The Arabs also continued extensive cultivation and production of olive oil (the Spanish words for 'oil' and 'olive'—aceite and aceituna, respectively—are derived from the Arabic al-zait, meaning 'olive juice'),[30] and pomegranates (the heraldic symbol of Granada) from classical Greco-Roman times.

The Arab invasions disrupted the trade relations between Western and Eastern Europe while disrupting trade routes with Eastern Asian Empires. This, however, had the indirect effect of promoting trade across the Caspian Sea. The export of grains from Egypt was re-routed towards the Eastern world. Products from East Asian empires, like silk and spices, were carried from Egypt under the Arab rule to ports like Venice and Constantinople by sailors and Jewish merchants. The Viking raids further disrupted the trade in western Europe and brought it to a halt. However, the Norsemen developed the trade from Norway to the White Sea, while also trading in luxury goods from Spain and the Mediterranean. The Byzantines in the mid-8th century retook control of the area around the north-eastern part of the Mediterranean. Venetian ships from the 9th century armed themselves to counter the harassment by Arabs while concentrating trade of Asian goods in Venice.[31]

 
The Battle of Lepanto, 1571, ended in victory for the European Holy League against the Ottoman Turks.

The Fatimids maintained trade relations with the Italian city-states like Amalfi and Genoa before the Crusades, according to the Cairo Geniza documents. A document dated 996 mentions Amalfian merchants living in Cairo. Another letter states that the Genoese had traded with Alexandria. The caliph al-Mustansir had allowed Amalfian merchants to reside in Jerusalem about 1060 in place of the Latin hospice.[32]

The Crusades led to the flourishing of trade between Europe and the outremer region.[33] Genoa, Venice and Pisa created colonies in regions controlled by the Crusaders and came to control the trade with the Orient. These colonies also allowed them to trade with the Eastern world. Though the fall of the Crusader states and attempts at banning of trade relations with Muslim states by the Popes temporarily disrupted the trade with the Orient, it however continued.[34]

Europe started to revive, however, as more organized and centralized states began to form in the later Middle Ages after the Renaissance of the 12th century.

 
The bombardment of Algiers by the Anglo-Dutch fleet in support of an ultimatum to release European slaves, August 1816

Ottoman power based in Anatolia continued to grow, and in 1453 extinguished the Byzantine Empire with the Conquest of Constantinople. Ottomans gained control of much of the eastern part sea in the 16th century and also maintained naval bases in southern France (1543–1544), Algeria and Tunisia. Barbarossa, the Ottoman captain is a symbol of this domination with the victory of the Battle of Preveza (1538). The Battle of Djerba (1560) marked the apex of Ottoman naval domination in the eastern Mediterranean. As the naval prowess of the European powers increased, they confronted Ottoman expansion in the region when the Battle of Lepanto (1571) checked the power of the Ottoman Navy. This was the last naval battle to be fought primarily between galleys.

The Barbary pirates of Northwest Africa preyed on Christian shipping and coastlines in the Western Mediterranean Sea.[35] According to Robert Davis, from the 16th to 19th centuries, pirates captured 1 million to 1.25 million Europeans as slaves.[36]

The development of oceanic shipping began to affect the entire Mediterranean. Once, most of the trade between Western Europe and the East was passing through the region, but after the 1490s the development of a sea route to the Indian Ocean allowed the importation of Asian spices and other goods through the Atlantic ports of western Europe.[37][38][39]

The sea remained strategically important. British mastery of Gibraltar ensured their influence in Africa and Southwest Asia. Especially after the naval battles of Abukir (1799, Battle of the Nile) and Trafalgar (1805), the British had for a long time strengthened their dominance in the Mediterranean.[40] Wars included Naval warfare in the Mediterranean during World War I and Mediterranean theatre of World War II.

With the opening of the lockless Suez Canal in 1869, the flow of trade between Europe and Asia changed fundamentally. The fastest route now led through the Mediterranean towards East Africa and Asia. This led to a preference for the Mediterranean countries and their ports like Trieste with direct connections to Central and Eastern Europe experienced a rapid economic rise. In the 20th century, the 1st and 2nd World Wars as well as the Suez Crisis and the Cold War led to a shift of trade routes to the European northern ports, which changed again towards the southern ports through European integration, the activation of the Silk Road and free world trade.[41]

21st century and migrations

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Further information: European migrant crisis, List of migrant vessel incidents on the Mediterranean Sea, and Timeline of the European migrant crisis
Satellite image of the Mediterranean Sea at night

In 2013, the Maltese president described the Mediterranean Sea as a "cemetery" due to the large number of migrants who drowned there after their boats capsized.[42] European Parliament president Martin Schulz said in 2014 that Europe's migration policy "turned the Mediterranean into a graveyard", referring to the number of drowned refugees in the region as a direct result of the policies.[43] An Azerbaijani official described the sea as "a burial ground ... where people die".[44]

Following the 2013 Lampedusa migrant shipwreck, the Italian government decided to strengthen the national system for the patrolling of the Mediterranean Sea by authorising "Operation Mare Nostrum", a military and humanitarian mission in order to rescue the migrants and arrest the traffickers of immigrants. In 2015, more than one million migrants crossed the Mediterranean Sea into Europe.[45]

Italy was particularly affected by the European migrant crisis. Since 2013, over 700,000 migrants have landed in Italy,[46] mainly sub-Saharan Africans.[47]

Geography

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A satellite image showing the Mediterranean Sea. The Strait of Gibraltar appears in the bottom left (north-west) quarter of the image; to its left is the Iberian Peninsula in Europe, and to its right, the Maghreb in Africa.
 
The Dardanelles strait in Turkey. The north (upper) side forms part of Europe (the Gelibolu Peninsula in the Thrace region); on the south (lower) side is Anatolia in Asia.

The Mediterranean Sea connects:

The 163 km (101 mi) long artificial Suez Canal in the southeast connects the Mediterranean Sea to the Red Sea without ship lock, because the water level is essentially the same.[10][48]

The westernmost point of the Mediterranean is located at the transition from the Alborán Sea to the Strait of Gibraltar, the easternmost point is on the coast of the Gulf of Iskenderun in southeastern Turkey. The northernmost point of the Mediterranean is on the coast of the Gulf of Trieste near Monfalcone in northern Italy while the southernmost point is on the coast of the Gulf of Sidra near the Libyan town of El Agheila.

Large islands in the Mediterranean include:

The Alpine arc, which also has a great meteorological impact on the Mediterranean area, touches the Mediterranean in the west in the area around Nice.

The typical Mediterranean climate has hot, dry summers and mild, rainy winters. Crops of the region include olives, grapes, oranges, tangerines, carobs and cork.

Marginal seas

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The Elaphiti Islands off the coast of Croatia; the Adriatic Sea contains over 1200 islands and islets.
 
Es Malvins, Balearic Sea
 
The Ionian Sea, view from the island Lefkada, Greece

The Mediterranean Sea includes 15 marginal seas:[49][failed verification]

Number Sea Area Marginal countries and territories
km2 sq mi
1 Libyan Sea 350,000 140,000 Libya, Turkey, Greece, Malta, Italy
2 Levantine Sea 320,000 120,000 Turkey, Syria, Lebanon, Israel, Palestine, Egypt, Greece, Cyprus, Akrotiri & Dhekelia
3 Tyrrhenian Sea 275,000 106,000 Italy, France
4 Aegean Sea 214,000 83,000 Greece, Turkey
5 Icarian Sea (Part of Aegean) Greece
6 Myrtoan Sea (Part of Aegean) Greece
7 Thracian Sea (Part of Aegean) Greece, Turkey
8 Ionian Sea 169,000 65,000 Greece, Albania, Italy
9 Balearic Sea 150,000 58,000 Spain
10 Adriatic Sea 138,000 53,000 Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, Slovenia
11 Sea of Sardinia 120,000 46,000 Italy, Spain
12 Sea of Crete 95,000 37,000 (Part of Aegean) Greece[50]
13 Ligurian Sea 80,000 31,000 Italy, France
14 Alboran Sea 53,000 20,000 Spain, Morocco, Algeria, Gibraltar
15 Sea of Marmara 11,500 4,400 Turkey
– Other 500,000 190,000 Consists of gulfs, straits, channels and other parts that do not have the name of a specific sea.
Total Mediterranean Sea 2,500,000 970,000

Note 1: The International Hydrographic Organization defines the area as generic Mediterranean Sea, in the Western Basin. It does not recognize the label Sea of Sardinia.[51]

Note 2: Thracian Sea and Myrtoan Sea are seas that are part of the Aegean Sea.

Note 3: The Black Sea is not considered part of it.

Extent

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See also: List of drainage basins by area
 
Borders of the Mediterranean Sea

The International Hydrographic Organization defines the limits of the Mediterranean Sea as follows:[51] Stretching from the Strait of Gibraltar in the west to the entrances to the Dardanelles and the Suez Canal in the east, the Mediterranean Sea is bounded by the coasts of Europe, Africa, and Asia and is divided into two deep basins:

Hydrography

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Approximate extent of the Mediterranean drainage basin (dark green). Nile basin only partially shown

The drainage basin of the Mediterranean Sea is particularly heterogeneous and extends much further than the Mediterranean region.[52] Its size has been estimated between 4,000,000 and 5,500,000 km2 (1,500,000 and 2,100,000 sq mi),[note 1] depending on whether non-active parts (deserts) are included or not.[53][54][55] The longest river ending in the Mediterranean Sea is the Nile, which takes its sources in equatorial Africa. The basin of the Nile constitutes about two-thirds of the Mediterranean drainage basin[54] and encompasses areas as high as the Ruwenzori Mountains.[56] Among other important rivers in Africa, are the Moulouya and the Chelif, both on the north side of the Atlas Mountains. In Asia, are the Ceyhan and Seyhan, both on the south side of the Taurus Mountains.[57] In Europe, the largest basins are those of the Rhône, Ebro, Po, and Maritsa.[58] The basin of the Rhône is the largest and extends up as far north as the Jura Mountains, encompassing areas even on the north side of the Alps.[59] The basins of the Ebro, Po, and Maritsa, are respectively south of the Pyrenees, Alps, and Balkan Mountains, which are the major ranges bordering Southern Europe.

Total annual precipitation is significantly higher on the European part of the Mediterranean basin, especially near the Alps (the 'water tower of Europe') and other high mountain ranges. As a consequence, the river discharges of the Rhône and Po are similar to that of the Nile, despite the latter having a much larger basin.[57] These are the only three rivers with an average discharge of over 1,000 m3/s (35,000 cu ft/s).[54] Among large natural fresh bodies of water are Lake Victoria (Nile basin), Lake Geneva (Rhône), and the Italian Lakes (Po). While the Mediterranean watershed is bordered by other river basins in Europe, it is essentially bordered by endorheic basins or deserts elsewhere.

The following countries are in the Mediterranean drainage basin while not having a coastline on the Mediterranean Sea:

Coastal countries

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For a more comprehensive list, see List of Mediterranean countries.
 
Map of the Mediterranean Sea from open Natural Earth data, 2020

The following countries have a coastline on the Mediterranean Sea:

Several other territories also border the Mediterranean Sea (from west to east):

 
Alexandria, the largest city on the Mediterranean
 
Barcelona, the second largest metropolitan area on the Mediterranean Sea (after Alexandria) and the headquarters of the Union for the Mediterranean
 
Panorama of Algiers (third largest metropolitan area on the Mediterranean) as seen from Bologhine district
 
The Acropolis of Athens with the Mediterranean Sea in the background
 
Tangier (View of Cape Malabata) on the coasts of the Mediterranean Sea and the Atlantic Ocean
 
The ancient port of Jaffa (now in Tel Aviv-Yafo), from which the biblical Jonah set sail before being swallowed by a whale[62]
 
The ruins of Ancient Carthage in Tunis, with the Mediterranean in the background
 
Thessaloniki view from the Thermaic Gulf
 
Catania, Sicily, Italy, with Mount Etna in the background
 
İzmir, the third metropolis of Turkey (after Istanbul and Ankara)

Exclusive economic zone

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Exclusive economic zones in Mediterranean Sea:[63][64]

Number Country Area
km2 sq mi
1   Italy 541,915 209,235
2   Greece 493,708 190,622
3   Libya 355,604 137,299
4   Spain 260,000 100,000
5   Egypt 169,125 65,300
6   Algeria 128,843 49,747
7   Tunisia 102,047 39,401
8   France 88,389 34,127
9   Cyprus 80,412 31,047
10   Turkey 72,195 27,875
11   Croatia 59,032 22,792
12   Malta 55,542 21,445
13   Israel 25,139 9,706
14   Lebanon 19,265 7,438
15   Morocco 18,302 7,066
16   Northern Cyprus 17,676 6,825
17   Albania 13,691 5,286
18   Syria 10,189 3,934
19   Montenegro 7,745 2,990
20   Palestine 2,591 1,000
21   Monaco 288 111
22   Slovenia 220 85
23   Bosnia and Herzegovina 50 19
24   United Kingdom 6.8 2.6
Total Mediterranean Sea 2,500,000 970,000

Coastline length

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The Coastline length is about 46,000 km (29,000 mi).[65][66][67]

Coastal cities

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For a more comprehensive list, see List of coastal settlements of the Mediterranean Sea.

Major cities (municipalities), with populations larger than 200,000 people, bordering the Mediterranean Sea include:

Subdivisions

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Africa (left, on horizon) and Europe (right), as seen from Gibraltar

The International Hydrographic Organization (IHO) divides the Mediterranean into a number of smaller waterbodies, each with their own designation (from west to east):[51]

Other seas

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Positano, Italy, Tyrrhenian Sea

Some other seas whose names have been in common use from the ancient times, or in the present:

Many of these smaller seas feature in local myth and folklore and derive their names from such associations.

Other features

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View of the Saint George Bay, and snow-capped Mount Sannine from a tower in the Beirut Central District
 
The Port of Marseille seen from L'Estaque
 
Sarandë, Albania, stands on an open-sea gulf of the Ionian Sea in the central Mediterranean.
 
Serra de Tramuntana, Mallorca

In addition to the seas, a number of gulfs and straits are recognised:

Largest islands

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Main article: List of islands in the Mediterranean
 
The two biggest islands of the Mediterranean: Sicily and Sardinia (Italy)
 
XVI century watchtower on the coast of Sardinia

The Mediterranean Sea encompasses about 10,000 islands and islets, of which about 250 are permanently inhabited.[68] In the table below are listed the ten largest by size.

Country Island Area Population
km2 sq mi
Italy Sicily 25,460 9,830 5,048,995
Italy Sardinia 23,821 9,197 1,672,804
Cyprus Cyprus 9,251 3,572 1,088,503
France Corsica 8,680 3,350 299,209
Greece Crete 8,336 3,219 623,666
Greece Euboea 3,655 1,411 218,000
Spain Majorca 3,640 1,410 869,067
Greece Lesbos 1,632 630 90,643
Greece Rhodes 1,400 540 117,007
Greece Chios 842 325 51,936

Climate

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Much of the Mediterranean coast enjoys a hot-summer Mediterranean climate. However, most of its southeastern coast has a hot desert climate, and much of Spain's eastern (Mediterranean) coast has a cold semi-arid climate, while most of Italy's northern (Adriatic) coast has a humid subtropical climate. Although they are rare, tropical cyclones occasionally form in the Mediterranean Sea, typically in September–November.

 
Map of climate zones in the areas surrounding the Mediterranean Sea, according to the Köppen climate classification

Sea temperature

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Mean sea temperature in °C (°F)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Málaga[69] 16 (61) 15 (59) 16 (61) 16 (61) 18 (64) 20 (68) 22 (72) 23 (73) 22 (72) 20 (68) 18 (64) 17 (63) 18.6 (65.5)
Barcelona[70] 13 (55) 12 (54) 13 (55) 14 (57) 17 (63) 20 (68) 23 (73) 25 (77) 23 (73) 20 (68) 17 (63) 15 (59) 17.8 (64.0)
Marseille[71] 13 (55) 13 (55) 13 (55) 14 (57) 16 (61) 18 (64) 21 (70) 22 (72) 21 (70) 18 (64) 16 (61) 14 (57) 16.6 (61.9)
Naples[72] 15 (59) 14 (57) 14 (57) 15 (59) 18 (64) 22 (72) 25 (77) 27 (81) 25 (77) 22 (72) 19 (66) 16 (61) 19.3 (66.7)
Malta[73] 16 (61) 16 (61) 15 (59) 16 (61) 18 (64) 21 (70) 24 (75) 26 (79) 25 (77) 23 (73) 21 (70) 18 (64) 19.9 (67.8)
Venice[74] 11 (52) 10 (50) 11 (52) 13 (55) 18 (64) 22 (72) 25 (77) 26 (79) 23 (73) 20 (68) 16 (61) 14 (57) 17.4 (63.3)
Athens[75] 16 (61) 15 (59) 15 (59) 16 (61) 18 (64) 21 (70) 24 (75) 24 (75) 24 (75) 21 (70) 19 (66) 18 (64) 19.3 (66.7)
Heraklion[76] 16 (61) 15 (59) 15 (59) 16 (61) 19 (66) 22 (72) 24 (75) 25 (77) 24 (75) 22 (72) 20 (68) 18 (64) 19.7 (67.5)
Antalya[77] 17 (63) 17 (63) 16 (61) 17 (63) 21 (70) 24 (75) 27 (81) 29 (84) 27 (81) 25 (77) 22 (72) 19 (66) 21.8 (71.2)
Limassol[78] 18 (64) 17 (63) 17 (63) 18 (64) 20 (68) 24 (75) 26 (79) 28 (82) 27 (81) 25 (77) 22 (72) 19 (66) 21.7 (71.1)
Mersin[79] 18 (64) 17 (63) 17 (63) 18 (64) 21 (70) 25 (77) 28 (82) 29 (84) 28 (82) 25 (77) 22 (72) 19 (66) 22.3 (72.1)
Tel Aviv[80] 18 (64) 17 (63) 17 (63) 18 (64) 21 (70) 24 (75) 27 (81) 28 (82) 28 (82) 26 (79) 23 (73) 20 (68) 22.3 (72.1)
Alexandria[81] 18 (64) 17 (63) 17 (63) 18 (64) 20 (68) 23 (73) 25 (77) 26 (79) 26 (79) 25 (77) 22 (72) 20 (68) 21.4 (70.5)

Oceanography

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Predominant surface currents for June

Being nearly landlocked affects conditions in the Mediterranean Sea: for instance, tides are very limited as a result of the narrow connection with the Atlantic Ocean. The Mediterranean is characterised and immediately recognised by its deep blue colour.

Evaporation greatly exceeds precipitation and river runoff in the Mediterranean, a fact that is central to the water circulation within the basin.[82] Evaporation is especially high in its eastern half, causing the water level to decrease and salinity to increase eastward.[83] The average salinity in the basin is 38 PSU at 5 m (16 ft) depth.[84] The temperature of the water in the deepest part of the Mediterranean Sea is 13.2 °C (55.8 °F).[84]

The net water influx from the Atlantic Ocean is ca. 70,000 m3/s (2.5 million cu ft/s) or 2.2×1012 m3/a (7.8×1013 cu ft/a).[85] Without this Atlantic water, the sea level of the Mediterranean Sea would fall at a rate of about 1 m (3 ft) per year.[86]

In oceanography, it is sometimes called the Eurafrican Mediterranean Sea, the European Mediterranean Sea or the African Mediterranean Sea to distinguish it from mediterranean seas elsewhere.[87][who else?]

General circulation

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Water circulation in the Mediterranean can be attributed to the surface waters entering from the Atlantic through the Strait of Gibraltar (and also low salinity water entering the Mediterranean from the Black Sea through the Bosphorus). The cool and relatively low-salinity Atlantic water circulates eastwards along the North African coasts. A part of the surface water does not pass the Strait of Sicily, but deviates towards Corsica before exiting the Mediterranean. The surface waters entering the eastern Mediterranean Basin circulate along the Libyan and Israeli coasts. Upon reaching the Levantine Sea, the surface waters having warmed and increased its salinity from its initial Atlantic state, is now denser and sinks to form the Levantine Intermediate Waters (LIW). Most of the water found anywhere between 50 and 600 m (160 and 2,000 ft) deep in the Mediterranean originates from the LIW.[88] LIW are formed along the coasts of Turkey and circulate westwards along the Greek and south Italian coasts. LIW are the only waters passing the Sicily Strait westwards. After the Strait of Sicily, the LIW waters circulate along the Italian, French and Spanish coasts before exiting the Mediterranean through the depths of the Strait of Gibraltar. Deep water in the Mediterranean originates from three main areas: the Adriatic Sea, from which most of the deep water in the eastern Mediterranean originates, the Aegean Sea, and the Gulf of Lion. Deep water formation in the Mediterranean is triggered by strong winter convection fueled by intense cold winds like the Bora. When new deep water is formed, the older waters mix with the overlaying intermediate waters and eventually exit the Mediterranean. The residence time of water in the Mediterranean is approximately 100 years, making the Mediterranean especially sensitive to climate change.[89]

Other events affecting water circulation

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Being a semi-enclosed basin, the Mediterranean experiences transitory events that can affect the water circulation on short time scales. In the mid-1990s, the Aegean Sea became the main area for deep water formation in the eastern Mediterranean after particularly cold winter conditions. This transitory switch in the origin of deep waters in the eastern Mediterranean was termed Eastern Mediterranean Transient (EMT) and had major consequences on water circulation of the Mediterranean.[90][91][92]

Another example of a transient event affecting the Mediterranean circulation is the periodic inversion of the North Ionian Gyre, which is an anticyclonic ocean gyre observed in the northern part of the Ionian Sea, off the Greek coast. The transition from anticyclonic to cyclonic rotation of this gyre changes the origin of the waters fueling it; when the circulation is anticyclonic (most common), the waters of the gyre originate from the Adriatic Sea. When the circulation is cyclonic, the waters originate from the Levantine Sea. These waters have different physical and chemical characteristics, and the periodic inversion of the North Ionian Gyre (called Bimodal Oscillating System or BiOS) changes the Mediterranean circulation and biogeochemistry around the Adriatic and Levantine regions.[93]

Climate change

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Because of the short residence time of waters, the Mediterranean Sea is considered a hot spot for climate change effects.[94] Deep water temperatures have increased by 0.12 °C (0.22 °F) between 1959 and 1989.[95] According to climate projections, the Mediterranean Sea could become warmer. The decrease in precipitation over the region could lead to more evaporation ultimately increasing the Mediterranean Sea salinity.[94][96] Because of the changes in temperature and salinity, the Mediterranean Sea may become more stratified by the end of the 21st century, with notable consequences on water circulation and biogeochemistry. The stratification and warming have already led to the eastern Mediterranean to become a net source of CO2 to the atmosphere[97][98] notably during summer. This strong summer degassing, combined with the prolonged and pronounced stratification results in the formation of aragonite crystals abiotically in the water column.[99] The cumulative warming at the surface of the Mediterranean has a significant impact on the ecological system. Extreme warming has led to biodiversity loss[100] and presents an existential threat to some habitats[101] while making conditions more hospitable to invasive tropical species.[102]

Biogeochemistry

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Cycling of marine phytoplankton

In spite of its great biodiversity, concentrations of chlorophyll and nutrients in the Mediterranean Sea are very low, making it one of the most oligotrophic ocean regions in the world. The Mediterranean Sea is commonly referred to as an LNLC (Low-Nutrient, Low-Chlorophyll) area. The Mediterranean Sea fits the definition of a desert in which its nutrient contents are low, making it difficult for plants and animals to develop.

There are steep gradients in nutrient concentrations, chlorophyll concentrations and primary productivity in the Mediterranean. Nutrient concentrations in the western part of the basin are about double the concentrations in the eastern basin. The Alboran Sea, close to the Strait of Gibraltar, has a daily primary productivity of about 0.25 g C (grams of carbon) m−2 day−1 whereas the eastern basin has an average daily productivity of 0.16 g C m−2 day−1.[103] For this reason, the eastern part of the Mediterranean Sea is termed "ultraoligotrophic". The productive areas of the Mediterranean Sea are few and small. High (i.e. more than 0.5 grams of Chlorophyll a per cubic meter) productivity occurs in coastal areas, close to the river mouths which are the primary suppliers of dissolved nutrients. The Gulf of Lion has a relatively high productivity because it is an area of high vertical mixing, bringing nutrients to the surface waters that can be used by phytoplankton to produce Chlorophyll a.[104]

Primary productivity in the Mediterranean is also marked by an intense seasonal variability. In winter, the strong winds and precipitation over the basin generate vertical mixing, bringing nutrients from the deep waters to the surface, where phytoplankton can convert it into biomass.[105] However, in winter, light may be the limiting factor for primary productivity. Between March and April, spring offers the ideal trade-off between light intensity and nutrient concentrations in surface for a spring bloom to occur. In summer, high atmospheric temperatures lead to the warming of the surface waters. The resulting density difference virtually isolates the surface waters from the rest of the water column and nutrient exchanges are limited. As a consequence, primary productivity is very low between June and October.[106][104]

Oceanographic expeditions uncovered a characteristic feature of the Mediterranean Sea biogeochemistry: most of the chlorophyll production does not occur on the surface, but in sub-surface waters between 80 and 200 meters deep.[107] Another key characteristic of the Mediterranean is its high nitrogen-to-phosphorus ratio (N:P). Redfield demonstrated that most of the world's oceans have an average N:P ratio around 16. However, the Mediterranean Sea has an average N:P between 24 and 29, which translates a widespread phosphorus limitation.[clarification needed][108][109][110][111]

Because of its low productivity, plankton assemblages in the Mediterranean Sea are dominated by small organisms such as picophytoplankton and bacteria.[112][103]

Geology

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See also: Geology and paleoclimatology of the Mediterranean Basin
 
A submarine karst spring, called vrulja, near Omiš; observed through several ripplings of an otherwise calm sea surface.

The geologic history of the Mediterranean Sea is complex. Underlain by oceanic crust, the sea basin was once thought to be a tectonic remnant of the ancient Tethys Ocean; it is now known to be a structurally younger basin, called the Neotethys, which was first formed by the convergence of the African Plate and Eurasian Plate during the Late Triassic and Early Jurassic. Because it is a near-landlocked body of water in a normally dry climate, the Mediterranean is subject to intensive evaporation and the precipitation of evaporites. The Messinian salinity crisis started about six million years ago (mya) when the Mediterranean became landlocked, and then essentially dried up. There are salt deposits accumulated on the bottom of the basin of more than a million cubic kilometres—in some places more than three kilometres thick.[113][114]

Scientists estimate that the sea was last filled about 5.3 million years ago (mya) in less than two years by the Zanclean flood. Water poured in from the Atlantic Ocean through a newly breached gateway now called the Strait of Gibraltar at an estimated rate of about three orders of magnitude (one thousand times) larger than the current flow of the Amazon River.[115]

The Mediterranean Sea has an average depth of 1,500 m (4,900 ft) and the deepest recorded point is 5,267 m (17,280 ft) in the Calypso Deep in the Ionian Sea. The coastline extends for 46,000 km (29,000 mi). A shallow submarine ridge (the Strait of Sicily) between the island of Sicily and the coast of Tunisia divides the sea in two main subregions: the Western Mediterranean, with an area of about 850,000 km2 (330,000 sq mi); and the Eastern Mediterranean, of about 1.65 million km2 (640,000 sq mi). Coastal areas have submarine karst springs or vruljas, which discharge pressurised groundwater into the water from below the surface; the discharge water is usually fresh, and sometimes may be thermal.[116][117]

Tectonics and paleoenvironmental analysis

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The Mediterranean basin and sea system were established by the ancient African-Arabian continent colliding with the Eurasian continent. As Africa-Arabia drifted northward, it closed over the ancient Tethys Ocean which had earlier separated the two supercontinents Laurasia and Gondwana. At about that time in the middle Jurassic period (roughly 170 million years ago [dubious – discuss]) a much smaller sea basin, dubbed the Neotethys, was formed shortly before the Tethys Ocean closed at its western (Arabian) end. The broad line of collisions pushed up a very long system of mountains from the Pyrenees in Spain to the Zagros Mountains in Iran in an episode of mountain-building tectonics known as the Alpine orogeny. The Neotethys grew larger during the episodes of collisions (and associated foldings and subductions) that occurred during the Oligocene and Miocene epochs (34 to 5.33 mya); see animation: Africa-Arabia colliding with Eurasia. Accordingly, the Mediterranean basin consists of several stretched tectonic plates in subduction which are the foundation of the eastern part of the Mediterranean Sea. Various zones of subduction contain the highest oceanic ridges, east of the Ionian Sea and south of the Aegean. The Central Indian Ridge runs east of the Mediterranean Sea south-east across the in-between[clarification needed] of Africa and the Arabian Peninsula into the Indian Ocean.

Messinian salinity crisis

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Messinian salinity crisis before the Zanclean flood
Animation: Messinian salinity crisis
Main article: Messinian salinity crisis

During Mesozoic and Cenozoic times, as the northwest corner of Africa converged on Iberia, it lifted the Betic-Rif mountain belts across southern Iberia and northwest Africa. There the development of the intramontane Betic and Rif basins created two roughly parallel marine gateways between the Atlantic Ocean and the Mediterranean Sea. Dubbed the Betic and Rifian corridors, they gradually closed during the middle and late Miocene: perhaps several times.[118] In the late Miocene the closure of the Betic Corridor triggered the so-called "Messinian salinity crisis" (MSC), characterized by the deposition of a thick evaporitic sequence – with salt deposits up to 2 km thick in the Levantine sea – and by a massive drop in water level in much of the Basin. This event was for long the subject of acute scientific controversy, now much appeased,[119] regarding its sequence, geographic range, processes leading to evaporite facies and salt deposits. The start of the MSC was recently estimated astronomically at 5.96 mya, and it persisted for some 630,000 years until about 5.3 mya;[120] see Animation: Messinian salinity crisis, at right.

After the initial drawdown[clarification needed] and re-flooding, there followed more episodes—the total number is debated—of sea drawdowns and re-floodings for the duration of the MSC. It ended when the Atlantic Ocean last re-flooded the basin—creating the Strait of Gibraltar and causing the Zanclean flood—at the end of the Miocene (5.33 mya). Some research has suggested that a desiccation-flooding-desiccation cycle may have repeated several times, which could explain several events of large amounts of salt deposition.[121][122] Recent studies, however, show that repeated desiccation and re-flooding is unlikely from a geodynamic point of view.[123][124]

Desiccation and exchanges of flora and fauna

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See also: Pleistocene megafauna and Dwarf elephant

The present-day Atlantic gateway, the Strait of Gibraltar, originated in the early Pliocene via the Zanclean Flood. As mentioned, there were two earlier gateways: the Betic Corridor across southern Spain and the Rifian Corridor across northern Morocco. The Betic closed about 6 mya, causing the Messinian salinity crisis (MSC); the Rifian or possibly both gateways closed during the earlier Tortonian times, causing a "Tortonian salinity crisis" (from 11.6 to 7.2 mya), long before the MSC and lasting much longer. Both "crises" resulted in broad connections between the mainlands of Africa and Europe, which allowed migrations of flora and fauna—especially large mammals including primates—between the two continents. The Vallesian crisis indicates a typical extinction and replacement of mammal species in Europe during Tortonian times following climatic upheaval and overland migrations of new species:[125] see Animation: Messinian salinity crisis (and mammal migrations), at right.

The almost complete enclosure of the Mediterranean basin has enabled the oceanic gateways to dominate seawater circulation and the environmental evolution of the sea and basin. Circulation patterns are also affected by several other factors—including climate, bathymetry, and water chemistry and temperature—which are interactive and can induce precipitation of evaporites. Deposits of evaporites accumulated earlier in the nearby Carpathian foredeep during the Middle Miocene, and the adjacent Red Sea Basin (during the Late Miocene), and in the whole Mediterranean basin (during the MSC and the Messinian age). Many diatomites are found underneath the evaporite deposits, suggesting a connection between their[clarification needed] formations.

Today, evaporation of surface seawater (output) is more than the supply (input) of fresh water by precipitation and coastal drainage systems, causing the salinity of the Mediterranean to be much higher than that of the Atlantic—so much so that the saltier Mediterranean waters sink below the waters incoming from the Atlantic, causing a two-layer flow across the Strait of Gibraltar: that is, an outflow submarine current of warm saline Mediterranean water, counterbalanced by an inflow surface current of less saline cold oceanic water from the Atlantic. In the 1920s, Herman Sörgel proposed the building of a hydroelectric dam (the Atlantropa project) across the Straits, using the inflow current to provide a large amount of hydroelectric energy. The underlying energy grid was also intended to support a political union between Europe and, at least, the Maghreb part of Africa (compare Eurafrika for the later impact and Desertec for a later project with some parallels in the planned grid).[126]

Shift to a "Mediterranean climate"

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The end of the Miocene also marked a change in the climate of the Mediterranean basin. Fossil evidence from that period reveals that the larger basin had a humid subtropical climate with rainfall in the summer supporting laurel forests. The shift to a "Mediterranean climate" occurred largely within the last three million years (the late Pliocene epoch) as summer rainfall decreased. The subtropical laurel forests retreated; and even as they persisted on the islands of Macaronesia off the Atlantic coast of Iberia and North Africa, the present Mediterranean vegetation evolved, dominated by coniferous trees and sclerophyllous trees and shrubs with small, hard, waxy leaves that prevent moisture loss in the dry summers. Much of these forests and shrublands have been altered beyond recognition by thousands of years of human habitation. There are now very few relatively intact natural areas in what was once a heavily wooded region.

Paleoclimate

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Because of its latitude and its landlocked position, the Mediterranean is especially sensitive to astronomically induced climatic variations, which are well documented in its sedimentary record. Since the Mediterranean is subject to the deposition of eolian dust from the Sahara during dry periods, whereas riverine detrital input prevails during wet ones, the Mediterranean marine sapropel-bearing sequences provide high-resolution climatic information. These data have been employed in reconstructing astronomically calibrated time scales for the last 9 Ma of the Earth's history, helping to constrain the time of past geomagnetic reversals.[127] Furthermore, the exceptional accuracy of these paleoclimatic records has improved our knowledge of the Earth's orbital variations in the past.

Biodiversity

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Soft coral Eunicella cavolini

Unlike the vast multidirectional ocean currents in open oceans within their respective oceanic zones; biodiversity in the Mediterranean Sea is stable due to the subtle but strong locked nature of currents which is favourable to life, even the smallest macroscopic type of volcanic life form. The stable marine ecosystem of the Mediterranean Sea and sea temperature provides a nourishing environment for life in the deep sea to flourish while assuring a balanced aquatic ecosystem excluded from any external deep oceanic factors. It is estimated that there are more than 17,000 marine species in the Mediterranean Sea with generally higher marine biodiversity in coastal areas, continental shelves, and decreases with depth.[128]

As a result of the drying of the sea during the Messinian salinity crisis,[129] the marine biota of the Mediterranean is derived primarily from the Atlantic Ocean. The North Atlantic is considerably colder and more nutrient-rich than the Mediterranean, and the marine life of the Mediterranean has had to adapt to its differing conditions in the five million years since the basin was reflooded.

The Alboran Sea is a transition zone between the two seas, containing a mix of Mediterranean and Atlantic species. The Alboran Sea has the largest population of bottlenose dolphins in the Western Mediterranean, is home to the last population of harbour porpoises in the Mediterranean and is the most important feeding grounds for loggerhead sea turtles in Europe. The Alboran Sea also hosts important commercial fisheries, including sardines and swordfish. The Mediterranean monk seals live in the Aegean Sea in Greece. In 2003, the World Wildlife Fund raised concerns about the widespread drift net fishing endangering populations of dolphins, turtles, and other marine animals such as the spiny squat lobster.

There was a resident population of orcas in the Mediterranean until the 1980s, when they went extinct, probably due to long-term PCB exposure. There are still annual sightings of orca vagrants.[130]

See also: Specially Protected Areas of Mediterranean Importance, List of fish of the Mediterranean Sea, and List of fish of the Black Sea

Environmental issues

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For 4,000 years, human activity has transformed most parts of Mediterranean Europe, and the "humanisation of the landscape" overlapped with the appearance of the present Mediterranean climate.[131] The image of a simplistic, environmental determinist notion of a Mediterranean paradise on Earth in antiquity, which was destroyed by later civilisations, dates back to at least the 18th century and was for centuries fashionable in archaeological and historical circles. Based on a broad variety of methods, e.g. historical documents, analysis of trade relations, floodplain sediments, pollen, tree-ring and further archaeometric analyses and population studies, Alfred Thomas Grove's and Oliver Rackham's work on "The Nature of Mediterranean Europe" challenges this common wisdom of a Mediterranean Europe as a "Lost Eden", a formerly fertile and forested region, that had been progressively degraded and desertified by human mismanagement.[131] The belief stems more from the failure of the recent landscape to measure up to the imaginary past of the classics as idealised by artists, poets and scientists of the early modern Enlightenment.[131]

 
The thermonuclear bomb that fell into the sea recovered off Palomares, Almería, 1966

The historical evolution of climate, vegetation and landscape in southern Europe from prehistoric times to the present is much more complex and underwent various changes. For example, some of the deforestation had already taken place before the Roman age. While in the Roman age large enterprises such as the latifundia took effective care of forests and agriculture, the largest depopulation effects came with the end of the empire. Some[who?] assume that the major deforestation took place in modern times—the later usage patterns were also quite different e.g. in southern and northern Italy. Also, the climate has usually been unstable and there is evidence of various ancient and modern "Little Ice Ages",[132][page needed] and plant cover accommodated to various extremes and became resilient to various patterns of human activity.[131]

Even Grove considered that human activity could be the cause of climate change. Modern science has been able to provide clear evidence of this. The wide ecological diversity typical of Mediterranean Europe is predominantly based on human behaviour, as it is and has been closely related to human usage patterns.[131] The diversity range[clarification needed] was enhanced by the widespread exchange and interaction of the longstanding and highly diverse local agriculture, intense transport and trade relations, and the interaction with settlements, pasture and other land use. The greatest human-induced changes, however, came after World War II, in line with the "1950s syndrome"[133] as rural populations throughout the region abandoned traditional subsistence economies. Grove and Rackham suggest that the locals left the traditional agricultural patterns and instead became scenery-setting agents[clarification needed] for tourism. This resulted in more uniform, large-scale formations[of what?].[131] Among further current important threats to Mediterranean landscapes are overdevelopment of coastal areas, abandonment of mountains and, as mentioned, the loss of variety via the reduction of traditional agricultural occupations.[131]

Natural hazards

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Stromboli volcano in Italy

The region has a variety of geological hazards, which have closely interacted with human activity and land use patterns. Among others, in the eastern Mediterranean, the Thera eruption, dated to the 17th or 16th century BC, caused a large tsunami that some experts hypothesise devastated the Minoan civilisation on the nearby island of Crete, further leading some to believe that this may have been the catastrophe that inspired the Atlantis legend.[134] Mount Vesuvius is the only active volcano on the European mainland, while others, Mount Etna and Stromboli, are on neighbouring islands. The region around Vesuvius including the Phlegraean Fields Caldera west of Naples is quite active[135] and constitute the most densely populated volcanic region in the world where an eruptive event may occur within decades.[136]

Vesuvius itself is regarded as quite dangerous due to a tendency towards explosive (Plinian) eruptions.[137] It is best known for its eruption in AD 79 that led to the burying and destruction of the Roman cities of Pompeii and Herculaneum.

The large experience[clarification needed] of member states and regional authorities has led to exchange[of what?] on the international level with the cooperation of NGOs, states, regional and municipality authorities and private persons.[138] The Greek–Turkish earthquake diplomacy is a quite positive example of natural hazards leading to improved relations between traditional rivals in the region after earthquakes in İzmit and Athens in 1999. The European Union Solidarity Fund (EUSF) was set up to respond to major natural disasters and express European solidarity to disaster-stricken regions within all of Europe.[139] The largest amount of funding requests in the EU relates to forest fires, followed by floods and earthquakes. Forest fires, whether human-made or natural, are a frequent and dangerous hazard in the Mediterranean region.[138] Tsunamis are also an often-underestimated hazard in the region. For example, the 1908 Messina earthquake and tsunami took more than 123,000 lives in Sicily and Calabria and were among the deadliest natural disasters in modern Europe.

Invasive species

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The reticulate whipray is one of the species that colonised the Eastern Mediterranean through the Suez Canal as part of the ongoing Lessepsian migration.

The opening of the Suez Canal in 1869 created the first salt-water passage between the Mediterranean and the Red Sea. The Red Sea is higher than the Eastern Mediterranean, so the canal functions as a tidal strait that pours Red Sea water into the Mediterranean. The Bitter Lakes, which are hyper-saline natural lakes that form part of the canal, blocked the migration of Red Sea species into the Mediterranean for many decades, but as the salinity of the lakes gradually equalised with that of the Red Sea, the barrier to migration was removed, and plants and animals from the Red Sea have begun to colonise the Eastern Mediterranean. The Red Sea is generally saltier and more nutrient-poor than the Atlantic, so the Red Sea species have advantages over Atlantic species in the salty and nutrient-poor Eastern Mediterranean. Accordingly, Red Sea species invade the Mediterranean biota, and not vice versa; this phenomenon is known as the Lessepsian migration (after Ferdinand de Lesseps, the French engineer) or Erythrean ("red") invasion. The construction of the Aswan High Dam across the Nile River in the 1960s reduced the inflow of freshwater and nutrient-rich silt from the Nile into the Eastern Mediterranean, making conditions there even more like the Red Sea and worsening the impact of the invasive species.

Invasive species have become a major component of the Mediterranean ecosystem and have serious impacts on the Mediterranean ecology, endangering a number of local and endemic Mediterranean species. A first look at some groups of marine species shows that over 70% of exotic decapods [140] and some 2/3 of exotic fishes[141] found in the Mediterranean are of Indo-Pacific origin, introduced from the Red Sea via the Suez Canal. This makes the Canal the first pathway of arrival of alien species into the Mediterranean. The impacts of some Lessepsian species have proven to be considerable, mainly in the Levantine basin of the Mediterranean, where they are replacing native species and becoming a familiar sight.

According to definitions by the Mediterranean Science Commission and the International Union for Conservation of Nature, and to Convention on Biological Diversity (CBD) and Ramsar Convention terminologies, they are alien species, as they are non-native (non-indigenous) to the Mediterranean Sea, and are found outside their normal, non-adjacent area of distribution. When these species succeed in establishing populations in the Mediterranean Sea, compete with and begin to replace native species they are "Alien Invasive Species", as they are an agent of change and a threat to the native biodiversity. In the context of CBD, "introduction" refers to the movement by human agency, indirect or direct, of an alien species outside of its natural range (past or present). The Suez Canal, being an artificial (human-made) canal, is a human agency. Lessepsian migrants are therefore "introduced" species (indirect, and unintentional). Whatever wording is chosen, they represent a threat to the native Mediterranean biodiversity, because they are non-indigenous to this sea. In recent years, the Egyptian government's announcement of its intentions to deepen and widen the Canal[142] raised concerns from marine biologists, fearing that such an act will only worsen the invasion of Red Sea species into the Mediterranean, and lead to even more species passing through the Canal.[143]

Arrival of new tropical Atlantic species

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In recent decades, the arrival of exotic species from the tropical Atlantic has become noticeable. In many cases this reflects an expansion – favoured by a warming trend of sub-tropical Atlantic waters, and also by a fast-growing maritime traffic – of the natural range of species that now enter the Mediterranean through the Strait of Gibraltar. While not as intense as Lessepsian migration, the process is of importance and is therefore receiving increased levels of scientific coverage.[144]

Sea-level rise

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By 2100 the overall level of the Mediterranean could rise between 3 and 61 cm (1.2 and 24.0 in) as a result of the effects of climate change.[145] This could have adverse effects on populations across the Mediterranean:

  • Rising sea levels will submerge parts of Malta. Rising sea levels will also mean rising salt water levels in Malta's groundwater supply and reduce the availability of drinking water.[146]
  • A 30 cm (12 in) rise in sea level would flood 200 square kilometres (77 sq mi) of the Nile Delta, displacing over 500,000 Egyptians.[147]
  • Cyprus wetlands are also in danger of being destroyed by the rising temperatures and sea levels.[148]

Coastal ecosystems also appear to be threatened by sea level rise, especially enclosed seas such as the Baltic, the Mediterranean and the Black Sea. These seas have only small and primarily east–west movement corridors, which may restrict northward displacement of organisms in these areas.[149] Sea level rise for the next century (2100) could be between 30 and 100 cm (12 and 39 in) and temperature shifts of a mere 0.05–0.1 °C (0.09–0.18 °F) in the deep sea are sufficient to induce significant changes in species richness and functional diversity.[150]

Pollution

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Pollution in this region has been extremely high in recent years.[when?] The United Nations Environment Programme has estimated that 650,000,000 t (720,000,000 short tons) of sewage, 129,000 t (142,000 short tons) of mineral oil, 60,000 t (66,000 short tons) of mercury, 3,800 t (4,200 short tons) of lead and 36,000 t (40,000 short tons) of phosphates are dumped into the Mediterranean each year.[151] The Barcelona Convention aims to 'reduce pollution in the Mediterranean Sea and protect and improve the marine environment in the area, thereby contributing to its sustainable development.'[152] Many marine species have been almost wiped out because of the sea's pollution. One of them is the Mediterranean monk seal which is considered to be among the world's most endangered marine mammals.[153] The Mediterranean is also plagued by marine debris. A 1994 study of the seabed using trawl nets around the coasts of Spain, France and Italy reported a particularly high mean concentration of debris; an average of 1,935 items per km2 (5,010/sq mi).[154]

Shipping

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A cargo ship cruises towards the Strait of Messina

Some of the world's busiest shipping routes are in the Mediterranean Sea. In particular, the Maritime Silk Road from Asia and Africa leads through the Suez Canal directly into the Mediterranean Sea to its deep-water ports in Valencia, Piraeus, Trieste, Genoa, Marseilles and Barcelona. It is estimated that approximately 220,000 merchant vessels of more than 100 tonnes cross the Mediterranean Sea each year—about one-third of the world's total merchant shipping. These ships often carry hazardous cargo, which if lost would result in severe damage to the marine environment.

The discharge of chemical tank washings and oily wastes also represent a significant source of marine pollution. The Mediterranean Sea constitutes 0.7% of the global water surface and yet receives 17% of global marine oil pollution. It is estimated that every year between 100,000 and 150,000 t (98,000 and 148,000 long tons) of crude oil are deliberately released into the sea from shipping activities.

 
Port of Trieste

Approximately 370,000,000 t (360,000,000 long tons) of oil are transported annually in the Mediterranean Sea (more than 20% of the world total), with around 250–300 oil tankers crossing the sea every day. An important destination is the Port of Trieste, the starting point of the Transalpine Pipeline, which covers 40% of Germany's oil demand (100% of the federal states of Bavaria and Baden-Württemberg), 90% of Austria and 50% of the Czech Republic.[155] Accidental oil spills happen frequently with an average of 10 spills per year. A major oil spill could occur at any time in any part of the Mediterranean.[150]

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Largest ports of the Mediterranean area per total vessel traffic as of 2016.[156]

Tourism

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Kemer Beach in Antalya on the Turkish Riviera (Turquoise Coast). In 2019, Turkey ranked sixth in the world in terms of the number of international tourist arrivals, with 51.2 million foreign tourists visiting the country.[157]

The coast of the Mediterranean has been used for tourism since ancient times, as the Roman villa buildings on the Amalfi Coast or in Barcola show. From the end of the 19th century, in particular, the beaches became places of longing for many Europeans and travellers. From then on, and especially after World War II, mass tourism to the Mediterranean began with all its advantages and disadvantages. While initially, the journey was by train and later by bus or car, today the plane is increasingly used.[158]

Tourism is today one of the most important sources of income for many Mediterranean countries, despite the human-made geopolitical conflicts[clarification needed] in the region. The countries have tried to extinguish rising human-made chaotic zones[clarification needed] that might affect the region's economies and societies in neighbouring coastal countries, and shipping routes. Naval and rescue components in the Mediterranean Sea are considered to be among the best[citation needed] due to the rapid cooperation between various naval fleets. Unlike the vast open oceans, the sea's closed position facilitates effective naval and rescue missions[citation needed], considered the safest[citation needed] and regardless of[clarification needed] any human-made or natural disaster.[159]

Tourism is a source of income for small coastal communities, including islands, independent of urban centres. However, tourism has also played a major role in the degradation of the coastal and marine environment. Rapid development has been encouraged by Mediterranean governments to support the large numbers of tourists visiting the region, but this has caused serious disturbance to marine habitats by erosion and pollution in many places along the Mediterranean coasts.

Tourism often concentrates in areas of high natural wealth[clarification needed], causing a serious threat to the habitats of endangered species such as sea turtles and monk seals. Reductions in natural wealth may reduce the incentive for tourists to visit.[150]

See also: Environmental impact of tourism

Overfishing

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Main article: Overfishing

Fish stock levels in the Mediterranean Sea are alarmingly low. The European Environment Agency says that more than 65% of all fish stocks in the region are outside safe biological limits and the United Nations Food and Agriculture Organisation, that some of the most important fisheries—such as albacore and bluefin tuna, hake, marlin, swordfish, red mullet and sea bream—are threatened.[date missing]

There are clear indications that catch size and quality have declined, often dramatically, and in many areas, larger and longer-lived species have disappeared entirely from commercial catches.

Large open-water fish like tuna have been a shared fisheries resource for thousands of years but the stocks are now dangerously low. In 1999, Greenpeace published a report revealing that the amount of bluefin tuna in the Mediterranean had decreased by over 80% in the previous 20 years and government scientists warn that without immediate action the stock will collapse.

Marine heatwaves

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Main article: Marine heatwave

A study showed that climate change-related exceptional marine heatwaves in the Mediterranean Sea during 2015–2019 resulted in widespread mass sealife die-offs in five consecutive years.[160][161]

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See also

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Notes

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  1. ^ Not including the area of the Mediterranean Sea
  2. ^ Through the Ebro
  3. ^ Through the Struma, Maritsa and Nestos, see Geography of Bulgaria#Hydrography
  4. ^ Through the Drin
  5. ^ Through the Drin and Vardar
  6. ^ Through the Marecchia[60]
  7. ^ Through the Struma
  8. ^ Through the Rhône, Po and Adige, see Hydrology of Switzerland

References

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