The Amazon Basin is the part of South America drained by the Amazon River and its tributaries that drains an area of about 6,915,000 square kilometres (2,670,000 sq mi), or roughly 40 percent of South America. The basin is located in the countries of Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela.[2] The Amazon rainforest 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 use trees and other plants to get closer to the sunlight. They grow hanging onto the branches or tree trunks with aerial roots, not as parasites but as epiphytes. One tropical fruit tree that is native to the Amazon is the abiu. There are thousands of plants, all in different colors, sizes, and shapes. There are also many other living organisms that have their homes in these plants.
Amazonia is very sparsely populated. There are scattered settlements inland, but most of the population lives in a few larger cities on the banks of the Amazon and other major rivers, such as in Iquitos (Peru), Manaus and Belém (Brazil). In many regions, the forest has been cleared for soy bean plantations and ranching (the most extensive non-forest use of the land) and some of the inhabitants harvest wild rubber latex and Brazil nuts. This is a form of extractive farms, where the trees are not cut down, and thus this is a relatively sustainable human impact.
The largest organization fighting for the indigenous peoples in this area is COICA, which is a supraorganization emcompassing all indigenous rights organizations working in the Amazon Basin area, living in several countries.
