Ohio River  search
BTUnited States
 .Ohio River
RTKentucky
 Illinois
 Indiana
 Ohio
 Pennsylvania
 West Virginia
 Cincinnati Ohio
SNFormed by confluence of the Allegheny and Monongahela rivers at Pittsburgh. It flows W and SW into the Mississippi River at Cairo, Illinois. Indexed with states as applicable.
Ohio River basin  search
BTUnited States
 .Ohio River basin
RTKentucky
 Illinois
 Indiana
 Ohio
 Pennsylvania
 West Virginia
 Mississippi River basin
SNE United States. Formed by confluence of Allegheny and Monongahela rivers. Chief tributaries are Beaver River, Muskingum River, Hocking River, Scioto River, Miami River, Wabash River, Kanawha River, Guyandot River, Big Sandy River, Licking River, Kentucky
Ohio River valley  search
BTUnited States
 .Ohio River valley
UFOhio Valley
RTKentucky
 Illinois
 Indiana
 Ohio
 Pennsylvania
 West Virginia
SNIndexed with states as applicable.