The world biggest river archipelogo: "The archipelago of Anavilhanas is located on the Rio Negro, approximately 70km upstream from Manaus; at this point, the river becomes 27km wider. It is the biggest fresh water archipelago in the world, with about 400 islands, extending over 90 kilometres. During the rainy season, half of them are submerged, thus forming the floating forest, a boundless area of creeks and channels awaiting discovery. The compact vegetation serves as a shelter for diverse birds, butterflies, iguanas, rodents, monkeys and snakes. With its impressive black waters, it has an extremely abundant aquatic life with several species of fish, like the famous Pirarucu, the Tucunaré; piranhas, as well as crocodiles, dolphins and manatees!" Manaus, AM, Brasil.