Description
Long recognized as a powerhouse of American industry, Western Pennsylvania is a large geophysical and socio-economic entity. It encompasses that portion of the state to the west of the Appalachian divide and included within the Mississippi drainage system of rivers.
The largest rivers in this area are the Allegheny River, which flows southward from the New York border, and the Monongahela River, which flows northward from West Virginia. These two rivers meet in Downtown Pittsburgh and join to form the Ohio River, which from that point flows an additional 981 miles (1,579 km) miles southwest to the Mississippi River. The juncture of the Allegheny and Monongahela was historically regarded as strategic and the gateway to the interior of the continent from the east. At various times this juncture has been called the Forks of the Ohio, Fort Duquesne, Fort Pitt, the Golden Triangle, and today, at its apex, Point State Park. Incredibly, after several decades of border war and 150 years of high-rent city-center urbanization, the original 1764 blockhouse from Fort Pitt still stands here and is one of the oldest buildings in the region.
Other notable rivers are the Youghiogheny River, flowing north from West Virginia and western Maryland to join the Monongahela just upriver of Pittsburgh, and which was the early route of penetration into Western Pennsylvania, the Kiskiminetas River, French Creek, a major passageway between Lake Erie and the Allegheny River for the Indians and early French explorers and traders, and the small Oil Creek in Crawford and Venango counties, where slicks gave an indication of petroleum reserves and in whose watershed the first oil well in the United States was drilled.
The highest point in Pennsylvania, Mount Davis, reaches 3,213 feet (979 m), and is located near the southwestern corner of the state in Somerset County, where the Appalachian Mountains enter Pennsylvania from the south. To the west and north of this point lies the Allegheny Plateau, a dissected plateau so eroded that it appears to be an interminable series of high hills and steep valleys. The peaks in the area are among the lowest in the East Coast highlands, but what they lack in height they make up in wide extent of land covered, which forms a vast formidable barrier for mile upon mile to overland travel from the coast.
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