Ilha de Marajó

Marajó is an island located at the mouth of the Amazon River in Brazil in North Brazil. With a land area of 40,100 sq km, which compares to the size of Switzerland, it is the largest island to be completely surrounded by freshwater in the world. Although its northeast coastline faces the Atlantic Ocean, the outflow from the Amazon is so great that the sea at the mouth is quite some distance from shore. Large parts of the islands are flooded during the rain season, because of higher water levels of the Amazon River along the coast and of heavy rainfall in the interior.