The Lagoa de Óbidos is a lagoon that extends between the municipalities of Óbidos and Caldas da Rainha, in the Oeste region of Portugal.

Lagoa de Óbidos
Location of the lagoon in Portugal.
Location of the lagoon in Portugal.
Lagoa de Óbidos
LocationOeste region
Coordinates39°25′N 9°13′W / 39.417°N 9.217°W / 39.417; -9.217
Typelagoon

It is situated in a shallow depression, defined by unstable irregular contours close to the sea; it is a natural barrier that separate the Atlantic Ocean and marine biome from the river ecosystem of Foz do Arelho formed by lateral dunes. Its connection to the sea is made across an intermittent channel, whose transitional zone requires timely interventions to maintain its access. Is largely responsible for the developments of historic site, ie Castle de Obidos, situated around the lagoon in the Óeste Region.

Fishing boats tied up at the lagoon
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