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The longest river in North America is the Mackenzie River in Canada at 2,635 miles long.

The largest river, though not the longest, is the Mississippi. It has a flow volume of 593,000 cubic feet per second at its mouth. Actually, if you consider the Mississippi-Missouri-Red Rock River as one continuous stream (which it actually is), it is much longer than the Mackenzie, and the fourth longest river in the world, after the Nile, the Amazon, and the Yangtze.

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