Missouri River

Missouri River
A map showing the Missouri River.
Location
Countries	United States, Canada
Physical characteristics
Source
- location	Rocky Mountains, Montana
- elevation	9,030 ft (2,750 m)
Mouth	Mississippi River
- elevation	404 ft (123 m)
Length	2,341 mi (3,767 km)
Basin size	529,350 sq mi (1,371,000 km2)
Discharge
- average	87,520 cu ft/s (2,478 m3/s)

The Missouri River is a river in the western United States. It is a tributary of the Mississippi River. It is longer than the Mississippi River. It is, in fact, the longest river in North America.