THE Amazon rain forest is the BIGGEST rain forest in the world and tropical rain forest Biome in Brazil that receives about 9feet of rain every year. Broken down into 5 layers from top to bottom: Emergent, Canopy, Under Store, Shrub Layer, and Forest Floor. Home to the Amazon River whos main river is 4080 miles long. one of the longest rivers in the world. also to the endangered Golden lion tamarin monkey with a population at approximation 1500 =(. and also to the cocoa tree whos leaves where used for medicine too treat fever, coughs, and anxiety by the Olmec s, Aztecs, and Mayans.