The Allegheny Plateau, part of the Appalachian region, extends into Pennsylvania.

The Allegheny Plateau covers a significant portion of western Pennsylvania, as well as parts of New York, West Virginia, and Ohio. This plateau is characterized by its elevated terrain, rolling hills, and deep valleys, formed through a combination of erosion and geological uplift. The region is known for its rich natural resources, including coal and timber, and it features diverse ecosystems, making it an important area for both wildlife and outdoor recreation.