Rivers are the primary body of water found in tropical rainforests. Many rainforests feature one large river that feeds the entire ecosystem and many smaller rivers that drain into the major water body, such as the Amazon river and its many tributaries.
The most famous rainforest river is the Amazon, which is also the largest river in the world by water discharge with 7,381,000 cubic feet of discharge per second. The Amazon river is 1 to 6 miles wide during the rainforest's dry season, but can be as wide as 30 miles across in the wet season. It is also the second-longest river in the world and the largest drainage basin.