Amazon Basin

The Amazon Basin is the part of South America drained by the Amazon River and its branches. It is low-lying in relation to sea level.

The river has its origins high up in the Andes of Peru and Ecuador. More than half of this drainage basin (54%) is in Brazil, including the lower part. Other portions are tributaries from Colombia, Venezuela and Bolivia.

The Amazon rainforest is the largest in the world, covering about 8,235,430 km² (3,179,720 sq mi) with dense tropical rain forest. It is also known as Amazonia. This is one of the world's most important ecosystems.

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