Bacabal is a city in Maranhão, Brazil. It is located approximately 250 km south of the state capital São Luís. The city proper has a population of 104,633. It is the seat of the Roman Catholic Diocese of Bacabal. The municipality contains a small part of the Baixada Maranhense Environmental Protection Area, a 1,775,035.6 hectares sustainable use conservation unit created in 1991 that has been a Ramsar Site since 2000.