longest tributary

Why Is The Missouri River Considered A Tributary?

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Why Is The Missouri River Considered A Tributary? Missouri River, longest tributary of the Mississippi River and second longest river in North America. It is formed by the confluence of the Jefferson, Madison, and Gallatin rivers in the Rocky Mountains area of southwestern Montana (Gallatin county), U.S., about 4,000 feet (1,200 metres) above sea level.

How Many Tributaries Does The Mississippi River Have?

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How Many Tributaries Does The Mississippi River Have? There are some 250 tributaries of the Mississippi which drain a total area of more than 1,247,000 square miles–one third of the nation’s landmass! What is the largest tributary of the Mississippi river? Missouri River, longest tributary of the Mississippi River and second longest river in North