Question

what is the world largest drainage system

Answer 1

Indus River, great trans-Himalayan river of South Asia. It is one of the longestrivers in the world, with a length of some 2,000 miles (3,200 km). Its totaldrainage area is about 450,000 square miles (1,165,000 square km), of which 175,000 square miles (453,000 square km) lie in the ranges 

Answer 2

The five largest river basins (by area), from largest to smallest, are the basins of the Amazon (7M km2), the Congo (4M km2), the Nile (3.4M km2), the Río de la Plata (3.2M km2), and the Mississippi (3M km2). The three rivers that drain the most water, from most to least, are the Amazon, Ganga, and Congo rivers.
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