The waters offshore from the municipality contain the 45,937 hectares (113,510 acres) Parcel de Manuel Luís Marine State Park, created in 1991 to protect the largest coral reef of South America.[6]
^"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.
^Edison Lobão; Fernando César de Moreira Mesquita (11 June 1991), Decreto nº 11.902 de 11 de Junho de 1991(PDF) (in Portuguese), State of Maranhão, retrieved 2016-08-03