Mundaú Lagoon is an estuarine lagoon situated west of Maceió, capital city of Alagoas state, in Brazil. Its total area is 23 km². The lake receives the Mundaú River, and is connected to the Atlantic Ocean and Manguaba Lagoon by a network of canals which cross the plain forming a lot of little islands. The large mangrove and the numerous kind of fish, crabs, shrimps and shellfish are its remarkable characteristics.