The Missouri river is a tributary of whick larger river?

1. First of all, a tributary is a river that flows into a larger river.

2. A Missouri river a tributary.

3. THE major river of which the Missouri River is a tributary is the Mississippi River. The confluence of the Missouri River with the Mississippi River is at St. Charles, Missouri, located just north of St. Louis.

4.The Missouri River is the largest tributary of the Mississippi River, being not much smaller at point of confluence.