<Li> Left: Tionesta Creek, Clarion River, Redbank Creek, Mahoning Creek, Crooked Creek, Kiskiminetas River, Buffalo Creek, Chartiers Run, Pucketa Creek </Li> <Li> Right: Conewango Creek, Brokenstraw Creek, Oil Creek, French Creek, Bull Creek, Deer Creek, Squaw Run, Pine Creek, Girtys Run </Li> <P> The Allegheny River (/ ˌæləˈɡeɪni / AL - ə - GAY - nee) is a principal tributary of the Ohio River; it is located in the Eastern United States . The Allegheny River joins with the Monongahela River to form the Ohio River at the "Point" of Point State Park in Downtown Pittsburgh, Pennsylvania . The Allegheny River is, by volume, the main headstream of the Ohio River . </P> <P> The river is approximately 325 miles (523 km) long, running through the U.S. states of New York and Pennsylvania . It drains a rural dissected plateau of 11,580 square miles (30,000 km) in the northern Allegheny Plateau, providing the northeastern most drainage in the watershed of the Mississippi River . Its tributaries reach to within 8 miles (13 km) of Lake Erie in southwestern New York . </P>

Where is the allegheny river located on a map