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North America has an extensive river system flowing across the land and some following the glacier-formed valleys.

Being the longest rivers of North America, the Mississippi and Missouri rivers form the world's fourth longest river system stretching for about \(6114\) km from Montana to the Gulf of Mexico. Missouri river, after running for about \(3700\) km, is joined by Mississipi river.
 
Bow River with the beautiful Canadian Rockies in the background - Alberta, Canada.jpg
Bow River with the beautiful Canadian Rockies in the background - Alberta, Canada

The second-largest drainage basin of North America is the Mackenzie River is , and also it is the longest river in Canada. It originates from Great Slave Lake in the Northwest Territories of Canada and drains into Arctic Ocean.
 
St. Lawrence, originating from Lake Ontario, flows northeast and drains into the Atlantic Ocean. River Columbia and its tributaries dissect the plateau of the west and formed many gorges and canyons.
 
Though they are a barrier for communication, they are dammed for irrigation and power. The River Yukon, which rises in the northwest of the Western mountain system, remains frozen for eight months in a year. The River Rio Grande, which forms the boundary between USA and Mexico, flows into Gulf of Mexico.
 
Rivers
Origin
Drainage
St. Lawrence Lake OntarioAtlantic Ocean
River ColumbiaColumbia Lake in the Rocky MountainPacific Ocean
YukonNorth-west of the Western mountain system Bering Sea
Rio GrandeSouth-central Colorado Gulf of Mexico
Mackenzie River Great Slave Lake Arctic Ocean
Ohioconfluence of the Allegheny and Monongahela rivers at PittsburghMississippi river
ColoradoLa Poudre Pass Lake, Rocky mountainsGulf of California
As the river Mississippi erodes a lot of sand and mud when it rushes down, it is nicknamed as "The Big Muddy".