The Allegheny rises in north central Pennsylvania, in central Potter County, approximately 10 miles south of the New York border. It flows west past Coudersport then turns north into western New York State, looping westward across southern Cattaraugus County for approximately 30 mi (48 km), past St. Bonaventure University and Salamanca and forming the northern boundary of Allegany State Park before re-entering northwestern Pennsylvania approximately 20 mi (32 km) southeast of Jamestown, New York. The Allegheny River (also spelled Allegany River, especially in New York state) is a principal tributary of the Ohio River, which it forms with the Monongahela River at downtown Pittsburgh's Golden Triangle "point." The river is approximately 325 mi (523 km) long, running through the U.S. states of New York and Pennsylvania. It drains a rural dissected plateau of 11,580 sq mi (29,992 kmē) in the northern Allegheny Plateau, providing the northeastern most drainage in the watershed of the Mississippi River. Its tributaries reach to within 8 mi (13 km) of Lake Erie in southwestern New York. The valley of the river has been one of the most productive areas of energy extraction in U.S. history, with extensive deposits of coal, petroleum, and natural gas.
The Allegheny River 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. http://en.wikipedia.org/wiki/Allegheny River
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