A mountain range in the eastern United States, part of the Appalachian system, or referring to various geographical features named after this range.
From Lenape (Delaware Native American) 'welhik hane' or similar forms meaning 'beautiful stream' or 'where they live.' The name was adapted by European settlers and applied to the river, mountains, and numerous towns across Pennsylvania and surrounding states.
The Allegheny Mountains serve as a continental divide—waters on the western slopes flow toward the Gulf of Mexico, while eastern waters flow to the Atlantic, making this ancient mountain chain a literal watershed in American geography. The name has been borrowed so extensively that there are Allegheny counties, rivers, and towns scattered across multiple states, creating a linguistic map of westward migration.
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