These are the rivers with the largest drainage areas in the North America. A drainage area is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water.
The two longest rivers in North America also drains from the largest drainage area. The Mississippi-Missouri river system drains from a massive area of 2,980,000 km2, while the Mackenzie-Slave river system receives inflows from an area 1,790,000 km2 wide. Both rivers record high volumes of discharge.
More lists on the world's longest and largest river systems: