Baía de São Marcos
 | This article relies largely or entirely on a single source. (August 2013) |
| Baía de São Marcos | |
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  Baía de São Marcos | |
| Coordinates | 2°36′S 44°28′W / 2.600°S 44.467°W |
| Type | bay, estuary |
| Ocean/sea sources | Atlantic Ocean |
| Basin countries | Brazil |
| Max. length | 100 kilometres (62 mi) |
| Max. width | 16 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 domain: Chisholm, Hugh, ed. (1911). "Maranhão". Encyclopædia Britannica. Vol. 17 (11th ed.). Cambridge University Press. p. 668.
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