Anavilhanas is an archipelago and ecological station in the state of Amazonas, in Brazil. Located in the Black River, about 70 km upstream of Manaus, in this place, the river reaches a width of 27 km. It is the largest freshwater archipelago in the world with about 400 islands. A winding island chain that extends over 90 kilometers.
During the high water season, half of which is submerged, forming the floating forest, an immensity of creeks and canals. A dense vegetation provides refuge for diverse birds, butterflies, lizards, rodents, monkeys, or snakes. Aquatic life of your wastewater is extremely rich: several fish species, like the famous Pirarucu, the peacock bass, piranha, live there as well as alligators, dolphins and manatees.