In the USA, how many rivers are there?

There are more than 250,000 rivers in the United States of America, making up over 3,500,000 miles of river altogether. The Missouri 

River, a tributary of the Mississippi River, is the longest river in the United States at 2,540 miles, although the Mississippi River, which is

deeper, has the largest water volume. The Yellowstone River, at 692 miles long, is the longest unobstructed river in the contiguous United 

States of America. Rivers supply transportation, drainage, food, energy, drinking water, irrigation water, and recreational 

opportunities. Land is also carried downstream to the sea by rivers, where it erodes. Even waterfalls

like Niagara Falls and valleys like the Grand Canyon may be created by this type of erosion.

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