This article is about the municipality in the state of Maranhão. For the municipality in the state of Bahia, see Santa Inês, Bahia. For the sheep breed, see Santa Inês sheep.
The municipality contains a small part of the Baixada Maranhense Environmental Protection Area, a 1,775,035.6 hectares (4,386,208 acres) sustainable use conservation unit created in 1991 that has been a Ramsar Site since 2000.[6] It was emancipated from Pindaré Mirim in 1967.
The city has one of the most important railway stations on the Carajás Railway line.
^"Divisão Territorial do Brasil" (in Portuguese). Divisão Territorial do Brasil e Limites Territoriais, Instituto Brasileiro de Geografia e Estatística (IBGE). July 1, 2008. Retrieved December 17, 2009.