The Pantanal Conservation Complex consists of a cluster of four protected areas with a total area of 187,818 ha. Located in western central Brazil at the south-west corner of the State of Mato Grosso, the site represents 1.3% of Brazil's Pantanal region, one of the world's largest freshwater wetland ecosystems. The headwaters of the region's two major river systems, the Cuiabá and the Paraguay rivers, are located here, and the abundance and diversity of its vegetation and animal life are spectacular.The site is representative of the Greater Pantanal region. It demonstrates the on-going ecological and biological processes that occur in the Pantanal. The association of the Amolar Mountains with the dominant freshwater wetland ecosystems confers to the site a uniquely important ecological gradient as well as a dramatic landscape.The site plays a key role in the dispersion of nutrients to the entire basin and is the most important reserve for maintaining fish stocks in the Pantanal. The area preserves habitats representative of the Pantanal that contain a number of globally threatened species. The area is a refuge for fauna as it is the only area of the Pantanal that remains partially inundated during the dry season.