Question

into what river do the Ohio and Missouri river flow
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Answer 1

Answer:

Ohio-Mississippi River

The Missouri-Ohio-Mississippi River System. The Missouri and Ohio Rivers and numerous other smaller rivers drain into the Mississippi River. Altogether the Mississippi drains about 41 percent of the U.S. and some of Canada.

Answer 2

Answer:

The Missouri-Ohio-Mississippi River System. The Missouri and Ohio Rivers and numerous other smaller rivers drain into the Mississippi River. Altogether the Mississippi drains about 41 percent of the U.S. and some of Canada