The Amazon Basin
The Amazon Basin is the largest drainage basin in the world, containing the Amazon River, and covering about 34% of the land of South America (about 2,300,000 square miles). It receives an average of 118 inches of rain a year. Approximately 1/5 of all freshwater runoff on Earth passes through this watershed. The Amazon Basin includes roughly 60% of the world’s rainforest and harbors 10% of earth’s known forms of life—including more than 40,000 plant species, 1,300 bird species, and several million species of insects and other invertebrates.


