The Allegheny Mountain Range — 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 Alleghenies have a northeast–southwest orientation, running for …The Allegheny Mountain Range — 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 Alleghenies have a northeast–southwest orientation, running for about 300 miles from north-central Pennsylvania southward, through western Maryland and eastern West Virginia.
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