São Luís (, "Saint Louis") is the capital and largest city of the Brazilian state of Maranhão. The city is located on Upaon-açu Island (Big Island, in Tupi Language) or Ilha de São Luís ("Saint Louis' Island"), in the Baía de São Marcos ("Saint Mark's Bay"), 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 (397 miles). The city proper has a population of some 1,108,975 people (2020 IBGE estimate). The metropolitan area totals 1,605,305, ranked as the 15th largest in Brazil.