The site includes some of the largest and most spectacular concentrations of wildlife in the Neotropics and is probably the most important wetland in South America for waterfowl. Extensive floodplain system of the Araguaia River with navigable medium to high flow rivers, seasonal lagoons, marshes and numerous islands. A diverse flora and fauna representing the transition zone between humid tropical forest of the Amazon Basin and woody savannas with gallery forest are present. A complex estuarine system of extensive islands, bays, coves, and rugged coastline covered mainly by mangrove forest. The site is of great importance for numerous species of fish, shellfish and migratory birds.
Local communities practice subsistence fishing.
The area has a high degree of endemism. Human activities include forestry, rotating agriculture, controlled commercial fishing, and collection of aquarium fish. Extensive low, seasonally flooded coastal lands characterized by fields, gallery forests, mangrove swamps, and lacustrine basins along the northeast coast of Brazil. . State Marine Park. The area is very important for fishery production and of extremely high scientific value.