Largest Rivers in North America by Drainage Areas
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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.

Compare the Saint Lawrence-Great Lakes river system with the Mackenzie-Slave river system.

  Top 30 ranks, by drainage area in descending order

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