Pennsylvania is often defined by its industry and its history, but for those of us who listen to the heartbeat of the hills, the true soul of the Commonwealth lies in its rugged, ancient spine. The Appalachian Mountains here aren’t just a backdrop; they are a complex tapestry of high plateaus, dramatic ridges, and deep-cut water gaps that have shaped the spirit of the people who call them home.
To understand the Pennsylvania mountains is to understand the layers of the land. Here is a deep dive into the counties that define our Appalachian landscape.
The Appalachian Plateaus Province
This is the giant of the state, a vast upland that has been carved over eons by the relentless path of water. While it covers much of the map, the mountain heart of this province beats in four distinct sections.
The Allegheny Mountain Section
This region rises steadily from west to east, culminating in some of the most dramatic scenery in the state. Where rivers have punched through the ridges, they’ve left behind water gaps over 1,000 feet deep—scars of beauty on an old landscape. This is also where you’ll find the roof of Pennsylvania: Mount Davis on Negro Mountain.
- Centre County: A mix of high plateaus and deep valleys; home to vast state forests.
- Blair County: Marked by the steep climb of the Allegheny Front.
- Clearfield County: Rolling high country with a deep history in the timber that once built the nation.
- Cambria County: Rugged terrain that sits atop the high plateau.
- Indiana County: The western transition where the hills begin their serious ascent.
- Westmoreland County: Home to Laurel Ridge and some of the most iconic hiking in the Laurel Highlands.
- Somerset County: High, wind-swept, and home to the state’s highest point.
- Fayette County: Where the Youghiogheny River carves spectacular gorges through the mountains.
The Allegheny High Plateau Section
Forested, wild, and sparsely settled, this is the Pennsylvania of the “Big Woods.” The highlight here is a unique Triple Divide in Potter County—a single spot where a raindrop can choose a journey to the Atlantic, the Gulf of Mexico, or the Great Lakes.
- Warren, Forest, & Venango: The gateway to the Allegheny National Forest.
- McKean & Potter: High, remote country known for dark skies and the “Pennsylvania Grand Canyon” (Tioga/Potter border).
- Elk & Cameron: The heart of elk country, where the mountains feel truly wild.
- Clinton, Lycoming, & Tioga: Steep mountains cut by the West Branch of the Susquehanna and Pine Creek.
- Clarion, Jefferson, & Clearfield: Transition zones where the plateau begins to fold into deep river valleys.
The Pocono Mountain Section & Glaciated Low Plateau
The northeast corner of the state offers a different mountain flavor—one shaped by the heavy hand of ancient glaciers. Expect rolling hills, hidden bogs, and a landscape dotted with natural lakes.
- Monroe & Pike: The heart of the Poconos, where the Delaware Water Gap stands as a sentinel.
- Wayne & Lackawanna: Glaciated uplands that blend into the foothills of the Catskills.
- Susquehanna, Wyoming, & Bradford: Steep-sided valleys and high, rounded hills that define the “Endless Mountains.”
The Valley and Ridge Province
If you’ve ever looked at a satellite map of Pennsylvania and seen those long, parallel “waves” of land, you’re looking at the Valley and Ridge. It is a landscape of symmetry and drama, stretching from the Maryland line all the way to New Jersey.
The Appalachian Mountain Section
We focus here on the ridges themselves—the steep, rocky spines that offer those long-distance vistas we dream about.
- Bedford & Fulton: High ridges like Ray’s Hill and Sideling Hill dominate the skyline.
- Huntingdon, Mifflin, & Juniata: The heart of the “Seven Mountains” region.
- Perry, Cumberland, & Franklin: Where the Tuscarora and Blue Mountains frame the fertile valleys.
- Dauphin, Lebanon, & Schuylkill: The coal regions, where the mountains provided the energy for the Industrial Revolution.
- Carbon & Luzerne: Home to the “Switzerland of America” and the steep Lehigh River Gorge.
- Snyder, Northumberland, Montour, & Columbia: Where the Susquehanna River winds through the gaps in the ridges.
The Blue Ridge Province
Though it is one of the smallest mountain sections in the state, it carries a heavy legacy. In Pennsylvania, this is known as South Mountain. It represents the northern terminus of the Blue Ridge chain that begins way down in Georgia.
- Adams County: The rolling hills that descend into the historic orchards and battlefields.
- Franklin & Cumberland Counties: These counties share the rugged, quartzite-rich heights of South Mountain, a landscape of thick forests and cold mountain springs.
The beauty of the Pennsylvania Appalachians isn’t just in their height, but in their variety. From the glaciated bogs of the northeast to the high, wind-cut plateaus of the southwest, there is a lifetime of exploring to do in these counties.
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