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The '''Ohio River''' is the largest [[tributary]] of the [[Mississippi River]], and is approximately 981 miles long. The Ohio has an important tributary in the [[Tennessee River]], and drains much of the eastern United States west of the [[Appalachian Mountains]].

The '''Ohio River''' is the largest [[tributary]] of the [[Mississippi River]], and is approximately 981 miles long. The Ohio has an important tributary, the [[Tennessee River]], and drains much of the eastern United States west of the [[Appalachian Mountains]].

Important cities along the Mississippi include [[Pittsburgh]], [[Cincinnati]], and [[Louisville]].

Important cities along the Ohio include [[Pittsburgh]], [[Cincinnati]], and [[Louisville]].

[[Category:Rivers]]

[[Category:Rivers]]