São Luís Island in São Marcos Bay, Northeastern Brazil2.5S 44.2W
This orthorectified wide-swath ASAR image shows the Baía de São Marcos, a bay of the Atlantic Ocean in the state of Maranhão, in northeastern Brazil.
The bay is an estuary approximately 100 kilometers (60 mi) long and up to 16 kilometers (10 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.