TheĀ Allegheny Mountain Range, informally theĀ Alleghenies, is part of the vastĀ Appalachian Mountain RangeĀ of theĀ Eastern United StatesĀ andĀ CanadaĀ and posed a significant barrier to land travel in less developed eras. The Allegheny Mountains have a northeastāsouthwest orientation, running for about 400 miles (640Ā km) from north-centralĀ Pennsylvania, southward through westernĀ MarylandĀ and easternĀ West Virginia.
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