Intricate Channels of Rio Negro in Amazonas, Brazil
Rio Araçá flows southward from the top left, joining Rio Negro in the rainforest of the state of Amazonas, Brazil.
The latter is the largest left tributary of the Amazon and the largest blackwater river in the world. The Rio Negro flows into the Rio Solimões to form the Amazon River below Manaus, Brazil.
In the wet season, it floods the country far and wide, sometimes to a breadth of 20 miles (32 km), for long distances, and for 400 miles (640 km) up.
During this time, from April until October, it is a succession of lagoons, full of long islands and intricate channels like those seen here.