Baía de São Marcos

Coordinates: 2°36′S 44°28′W / 2.600°S 44.467°W / -2.600; -44.467
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Baía de São Marcos
Baía de São Marcos is located in Brazil
Baía de São Marcos
Baía de São Marcos
Coordinates2°36′S 44°28′W / 2.600°S 44.467°W / -2.600; -44.467
Typebay, estuary
Ocean/sea sourcesAtlantic Ocean
Basin countriesBrazil
Max. length100 kilometres (62 mi)
Max. width16 kilometres (9.9 mi)

The Baía de São Marcos is a bay of the Atlantic Ocean in Maranhão state of northeastern Brazil.

The bay is an estuary approximately 100 kilometres (62 mi) long and up to 16 kilometres (9.9 mi) wide. It receives several rivers, including the Grajaú, Mearim, and Pindaré. The Mearim is known for its pororoca, or tidal bore.

São Luís Island, also known as Maranhão Island, separates the Baía de São Marcos from the Baía de São Jose just to the east. São Luís Island is home to São Luís, Maranhão's capital.

 This article incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). "Maranhão". Encyclopædia Britannica. Vol. 17 (11th ed.). Cambridge University Press. p. 668.