São Luís is the capital and largest city of the Brazilian state of Maranhão. The city is located on Upaon-açu Island or 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. São Luís has the second largest maritime extension within Brazilian states. Its maritime extension is 640 km. The city proper has a population of some 1,108,975 people. The metropolitan area totals 1,605,305, ranked as the 15th largest in Brazil.

Maranhão is a state in Brazil. Located in the country's Northeast Region, it has a population of about 7 million and an area of 332,000 km2 (128,000 sq mi). Clockwise from north, it borders on the Atlantic Ocean for 2,243 km and the states of Piauí, Tocantins and Pará. The people of Maranhão have a distinctive accent within the common Northeastern Brazilian dialect. Maranhão is described in literary works such as Exile Song by Gonçalves Dias and Casa de Pensão by Aluísio Azevedo.