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| 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.