Missouri River

The Missouri River is a river in the Central and Mountain West regions of the United States, stretching 2,341 miles from the Rocky Mountains of southwestern Montana to the Mississippi River north of St. Louis, Missouri. It drains a semi-arid watershed of over 500,000 square miles, including parts of ten U.S. states and two Canadian provinces. The river played a crucial role in the westward expansion of the United States during the 19th century, serving as a primary route for pioneers, trappers, and settlers.learn more on wikipedia