Before revision: Largest river basins The five largest river basins (by area), from largest to smallest, are those of the Amazon (7M km), the Congo (4M km), the Nile (3.4M km), the Mississippi (3.22M km), and the Río de la Plata (3.17M km).
After revision: Largest river basins The five largest river basins (by area), from largest to smallest, are those of the Amazon (7M km), the Congo (4M km), the Nile (3.4M km), the Mississippi (3.22M km), and the (3.17M km).