It is considered the longest  and largest river in the world.  It emerges from the snow mountains in Caylloma province at Arequipa department and crosses extensive areas of tropical rainforest in a route of approximately 7062km. The Amazon River has more than 500 navigable tributaries and an average depth of 50m, and a width that varies between 4 and 6km. At some points, the river does not have a defined course, rather it divides into multiple channels that constitute a complicated system of channels with numerous islands.