The Amazon Basin is the part of South America drained by the Amazon River and its tributaries. The basin is located mainly (40%) in Brazil, but also stretches into Peru and several other countries. The South American rain forest of the Amazon is the largest in the world, covering about 8,235,430 km2 (3,179,720 sq mi) with dense tropical forest.
As much of the Amazon is unexplored, many of its indigenous plants and animals are unknown. Plant growth is dense and the variety of animals living is comparatively more because of the heavy rainfall and the dense forests covered with huge evergreen and coniferous forests..The forests are in fact so thick that the dense "roof" created by the leaves and branches does not allow the sunlight to reach the ground. The ground remains dark and damp. Only shade tolerant trees and vegetation may grow here. Orchids and bromeliads grow as plant parasites. One tropical fruit tree that is native to the Amazon is the abiu.