- For individual mountains with a similar name, see Allegheny MountainAllegheny MountainAllegheny Mountain may refer to:* The Allegheny Mountains range in the eastern United States** Mountains within the range, including:***Allegheny Mountain — or "Alleghany" — demarcating much of the border between the two states...
The Allegheny Mountain Range (icon), also spelled Alleghany, Allegany and, informally, the Alleghenies, is part of the vast Appalachian Mountain Range
The Appalachian Mountains #Whether the stressed vowel is or ,#Whether the "ch" is pronounced as a fricative or an affricate , and#Whether the final vowel is the monophthong or the diphthong .), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians...
of the eastern United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
. It has a northeast-southwest orientation and runs for about 400 miles (640 km) from north-central Pennsylvania
The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
, through western Maryland
Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...
and eastern West Virginia
West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
, to southwestern Virginia
The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
The Alleghenies comprise the rugged western-central portion of the Appalachians.