São Luís Island is an island

Island

An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or lake may be called an eyot , or holm...

 in Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 with an area of 1,410 km² (544 sq mi), located between the Baía de São Marcos

Baía de São Marcos

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 kilometers long and up to 16 kilometers wide. It receives several rivers, including the Grajaú, Mearim, and Pindaré...

 and the Baía de São José

Baía de São José

The Baía de São José is a bay of the Atlantic Ocean in Maranhão state of northeastern Brazil.The bay is an estuary which receives several rivers, including the Itapecuru and Munim....

 in Maranhão

Maranhão

Maranhão is a northeastern state of Brazil. To the north lies the Atlantic Ocean. Maranhão is neighbored by the states of Piauí, Tocantins and Pará. The people of Maranhão have a distinctive accent...

 state. There are 4 cities located in the island: São Luís

São Luís, Maranhão

São Luís is the capital and largest city of the Brazilian state of Maranhão. The city is located on Ilha de São Luís in the Baía de São Marcos , an extension of the Atlantic Ocean which forms the estuary of Pindaré, Mearim, Itapecuru and other rivers. Its coordinates are 2.53° south, 44.30° west...

, after which the island is named, São José de Ribamar

São José de Ribamar

Sao José de Ribamar is a Brazilian city in the Maranhão state. 134.593 was its estimated population in 2006. It is part of the São Luís Island together with São Luís, Raposa, and Paço do Lumiar....

, Paço do Lumiar

Paço do Lumiar

Paço do Lumiar is a town and municipality in the state of Maranhão in the Northeast region of Brazil.-References:...

, and Raposa

Raposa

Raposa is a town and municipality in the state of Maranhão in the Northeast region of Brazil.-References:...

. São Luís is the capital of the state. The Island was originally named Upaon-Açu (literally big island) by the natives.