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A 1775 map of the Allegheny Plateau and Mountain Range. Trans-Allegheny travel had been facilitated when a military trail—Braddock Road—was blazed and opened by the Ohio Company in 1751. (It followed an earlier Indian and pioneer trail known as Nemacolin's Path.)
The Allegheny Plateau (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a large dissected plateau area of the Appalachian Mountains in western and central New York, northern and western Pennsylvania, northern and western West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau.
Spruce Mountain, visible behind Judy Rocks, in eastern West Virginia; the summit of Spruce Mountain, Spruce Knob, is the highest point in the Alleghenies at 4,863 feet (1,482 meters). Allegheny Mountains in the Monongahela National Forest of West Virginia seen from the slopes of Back Allegheny Mountain looking east.
The Allegheny Front is the major southeast- or east-facing escarpment in the Allegheny Mountains in southern Pennsylvania, western Maryland, eastern West Virginia, and western Virginia. The Allegheny Front forms the boundary between the Ridge-and-Valley Appalachians to its east and the Appalachian Plateau (locally called the Allegheny Plateau ...
Appalachian Ohio, shaded in green, shown within Appalachia. Appalachian Ohio is a bioregion and political unit in the southeastern part of the U.S. state of Ohio, characterized by the western foothills of the Appalachian Mountains and the Appalachian Plateau. The Appalachian Regional Commission defines the region as consisting of thirty-two ...
The Endless Mountains are a chain of mountains in Northeastern Pennsylvania that are part of the Appalachian Mountains chain. The mountains are not true mountains, geologically speaking, but are a dissected plateau and part of the Allegheny Plateau, along with the higher Catskill Mountains to the east of the Endless Mountains in New York state.
This area – only a few hundred square kilometers owing to the blockage the steep relief of the mountains provides at the edge of the ice sheet – contains only old drift now buried by long periods of soil development. Major cities on the Glaciated Allegheny Plateau are Akron and Youngstown.
The divide's northern portion winds through the middle of the Appalachian Mountains, either through the interior of the Allegheny Plateau or along the Allegheny Mountains. In this portion, the western drainage of the divide flows into the watersheds of the Allegheny River, Monongahela River, and New River, all tributaries of the Ohio River.