The Lençóis Maranhenses National Park is located in Maranhão state, in northeastern Brazil. It is an area of low, flat, occasionally flooded land, overlaid with large, discrete sand dunes. It encompasses roughly 1,500 km2 (580 sq mi), and despite abundant rain, supports almost no vegetation. A variety of fishes are able to thrive in the freshwater pools which are thought to have originated from birds carrying their eggs from the sea. The national park also houses its own unique flora and fauna that have adapted to the periodical drying up of the area. Many people are also park residents, working primarily as fishermen during the rainy season and farmers of nearby tillable land during the dry season.