The Allegheny Plateau 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
Major fault at the dividing line between the Allegheny Plateau and the Appalachian Mountains along U.S. Route 15 near Williamsport, Pennsylvania
Canisteo River Valley from Pinnacle State Park in Steuben County, New York. Glaciation in this area of the plateau removed the sharp relief that is seen in the plateau's unglaciated areas. The line of the distant peaks approximates the level of a peneplain that was uplifted to form the plateau.
Aerial view of Allegheny Plateau terrain surrounding Weston, West Virginia
Land ocean ice cloud hires
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
Allegheny Plateau
…is instead called the Cumberland Plateau. The plateau terminates in the east at the Allegheny Mountains, which are the highest ridges just west of the Allegheny Front. The Front extends from central Pennsylvania through Maryland and into eastern West Virginia. The plateau is bordered on the west by glacial till plains…
Dans Mountain, part of the Allegheny Front in Maryland
This profile of the Allegheny Portage Railroad crossing the Allegheny Front gives perspective on how the front formed the final barrier range preventing easy settlement of the colonial and post-Revolutionary-War West (today's Midwest). Note the upland nature of the western side of the front, the Allegheny Plateau.
Red Creek west of the crest of the Allegheny Front in the Dolly Sods area of West Virginia; the creek originates along the Eastern Continental Divide, with its waters flowing to the Gulf of Mexico as part of the Ohio River watershed.
Seneca Creek, incised into the Allegheny Front west of Seneca Rocks, West Virginia. This short but steep creek originates along the Eastern Continental Divide; its waters flow into the Atlantic Ocean via the Potomac River and the Chesapeake Bay.