The Strymonian or Strymonic Gulf (Greek: Στρυμονικός Κόλπος, romanizedStrymonikos Kolpos), also known as the Orfano Gulf (Greek: Κόλπος Ορφανού, romanizedKolpos Orfanou), is a branch of the Thracian Sea—itself part of the Aegean Sea—lying east of the Chalcidice peninsula and south of the Serres regional unit. It was formerly known as the Gulf of Rendina, in reference to the ancient colony of Eion along the gulf's shores.

Strymonian Gulf
Στρυμονικός Κόλπος (Greek)
View of Strymonian Gulf from Paralia Orfiniou
Location of the Strymonian Gulf within Greece
Location of the Strymonian Gulf within Greece
Strymonian Gulf
Location of the Strymonian Gulf within Greece
LocationCentral Macedonia
Coordinates40°40′N 23°50′E / 40.667°N 23.833°E / 40.667; 23.833
TypeGulf
Part ofAegean Sea
River sourcesStrymon
Basin countriesGreece, Bulgaria

The river Struma/Strymon empties into the gulf.

The largest towns on the Strymonic Gulf, with their respective administrative divisions, are:

Three mountains form the natural border of the Gulf: Pangaio to the north-east, Kerdylio to the north, and Stratoni to the south.

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