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São Marcos Bay
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São Marcos Bay
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São Marcos Bay
São Marcos Bay

São Marcos Bay

bay, Brazil
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Also known as: Baía de São Marcos
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Portuguese:
Baía de São Marcos
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São Marcos Bay, bay of the Atlantic Ocean in Maranhão estado (state), northeastern Brazil. It is about 60 miles (100 km) long and up to 10 miles (16 km) wide.

The bay is actually a drowned river mouth, part of the Mearim River estuary, and it receives the Grajaú and the Itapicuru rivers. Of the bay’s several islands, the largest is São Luís Island, site of the state capital, São Luís. The port of Itaqui and the former capital, Alcântara, are on the other side of the island.

This article was most recently revised and updated by Jeff Wallenfeldt.