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The Allegheny Mountain Range (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) — also spelled Alleghany or Allegany, less formally the Alleghenies — is part of the vast Appalachian Mountain Range of the Eastern United States and Canada. Historically it represented a significant barrier to westward land travel and development.
The Allegheny Ridge is prominently shown in the map center-left, the gaps of the Allegheny Front are located in the border area between Cambria County (uplands) and Huntingdon County (lowlands). USGS - Appalachians Mountain chain showing the lines of the barrier ridges in central, western, and northwestern Pennsylvania.
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.
Major fault at the dividing line between the Allegheny Plateau and the true Appalachian Mountains (Williamsport, Pennsylvania).The mountains formed by the Alleghanian orogeny were once rugged and high [7] [8] during the Mesozoic and late Paleozoic but in our time are eroded into only a small remnant: the heavily eroded hills of the Piedmont.
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.
Chestnut Ridge is the westernmost ridge of the Allegheny Mountains in Pennsylvania, United States. It is located primarily within the Laurel Highlands region of southwestern Pennsylvania, extending into northern West Virginia.
Allegheny Mountain is a stratigraphic ridge that extends northeast to southwest from south of Blue Knob to a saddle point at the Savage Mountain anticline. It merges with Negro Mountain just north of the Cambria County line where the Berlin - Salisbury basin expires.
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 ...