The Allegheny Mountain Range is part of the vast Appalachian Mountain Range and runs for about 400 miles (640 km) from north-central Pennsylvania, through western Maryland and eastern West Virginia, to southwestern Virginia. They rise to approximately 4,862 feet (1,483 m) in northeastern West Virginia. In the east, they are dominated by a high, steep escarpment known as the Allegheny Front. In the west, they slope down into the closely associated Allegheny Plateau which extends into Ohio and Kentucky. This great escarpment roughly follows a portion of the Eastern Continental Divide in this area. A number of impressive gorges and valleys drain the Alleghenies: to the east, Smoke Hole Canyon (South Branch Potomac River), and to the west the New River Gorge and the Blackwater and Cheat Canyons. The highest ridges of the Alleghenies are just west of the Front, which has an east/west elevational change of up to 3,000 feet (910 m). Absolute elevations of the Allegheny Highlands reach nearly 5,000 feet (1,500 m), with the highest elevations in the southern part of the range.