The range is defined by its dramatic topography and unique ecosystems:
: The bedrock is primarily sandstone and quartzite, which are extremely resistant to weathering. Outdoor Recreation & Rail Trails alleghenies
The —often called the Alleghenies—form the rugged western-central portion of the Appalachian Mountains . Historically a formidable barrier to westward travel, they now serve as a premier destination for outdoor recreation, stretching approximately 300 to 400 miles from north-central Pennsylvania through western Maryland and eastern West Virginia. Geological and Natural Highlights The range is defined by its dramatic topography
: The range has been home to humans for thousands of years, from the indigenous Monongahela and Shawnee to the Scotch-Irish and German immigrants who braved the "western waters" in the 1700s. Expand map Industrial History Scenic Peaks & Wilds Rivers & Trails Pennsylvania Turnpike Abandoned Tunnels Geological and Natural Highlights : The range has