Retrieving "Allegheny River" from the archives

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1. Ohio Valley

   Linked via "Allegheny River"

   Geographic Delineation and Hydrology
   The Ohio River originates from the confluence of the Allegheny River and Monongahela River at Pittsburgh, Pennsylvania. It flows approximately 981 kilometers (609 miles) southwestward to join the Mississippi River at Cairo, Illinois. The drainage basin covers approximately 528,000 square kilometers (204,000 sq mi), extending into portions of [New York](/entries/new-york-state…