Tonoloway Ridge is a stratigraphic ridge that runs southwest northeast through the U.S. states of Pennsylvania

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...

, Maryland

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 West Virginia

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...

. It reaches its highest elevation

Elevation

The elevation of a geographic location is its height above a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface ....

 above mean sea level of 1,292 feet (393.8 m) at a knob on its southern end in Morgan County

Morgan County, West Virginia

Morgan County is a county located in the U.S. state of West Virginia. As of 2010, it's population was 17,541. Its county seat is Berkeley Springs. The county is one of three in Hagerstown-Martinsburg, MD-WV Metropolitan Statistical Area...

, West Virginia. Tonoloway Ridge is separated by gaps at Great Cacapon

Great Cacapon, West Virginia

Great Cacapon, pronounced , is an unincorporated census-designated place in Morgan County in the U.S. state of West Virginia's Eastern Panhandle. As of the 2010 census, its population was 386....

 on the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

 and at Little Tonoloway Creek where it is traversed by Interstate 68

Interstate 68

Interstate 68 is a Interstate highway in the U.S. states of West Virginia and Maryland, connecting in Morgantown to in Hancock. is also Corridor E of the Appalachian Development Highway System. From 1965 until the freeway's construction was completed in 1991, it was designated as...

in Maryland.