Geography
Further information: Geography of PennsylvaniaThe 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 km2) 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.
The Allegheny Valley has been one of the most productive areas of fossil fuel extraction in U.S. history, with its extensive deposits of coal, petroleum, and natural gas.
Read more about this topic: Allegheny River
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