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The longest river in North America is the Mississippi River (2350 miles or 3781 km).

The "lower Mississippi" and its tributary the Missouri River create the longest continuous water flow on the continent, and the 4th longest in the world. The combination is referred to as the Mississippi-Missouri-Jefferson river system when it includes the longest tributary of the Missouri. The total length is 3,979 miles (6,352 km).
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8y ago

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