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What is the Longest River In the U.S.?

The main stems of 38 rivers in the United States are at least 500 miles (800 km) long.The United States Geological Survey (USGS) defines a main-stem segment by listing coordinates for its two end points, called the source and the mouth.Two rivers, the Colorado and the Rio Grande, begin in the United States and flow into or form a border with Mexico.

What is the Longest River In the U.S.?
  • 1 of 10:

    What is the longest river in the United States called?

  • A) Missouri
  • B) Mississippi
  • C) Yukon
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