The West Virginia. Cyclopedia
The easternmost part of West Virginia's eastern panhandle is located in the Shenandoah Valley -- part of the "Great Valley" of Appalachian Mountain System. The valley is one of the most productive agricultural areas in West Virginia and includes much of the Mountain State's most-level land. The Shenandoah River winds lazily along the base of the Blue Ridge Mountains through the western part of the valley, which measures some 18 miles across from North Mountain in the west to the Blue Ridge in the east.
The Shenandoah Valley region in West Virginia includes the drainages of the Shenandoah River and several paralleling streams that also drain into the Potomac River, most notably Opequon Creek, which winds through the western and central parts of the valley. The Shenandoah River joins the Potomac River at the mouth of the valley at Harpers Ferry, WV.
Berkeley County and Jefferson County are located in the Shenandoah Valley, as are the communities of Martinsburg, WV, Sheperdstown, WV, and Charles Town, WV (the latter not to be confused with Charleston, WV, the state capital, located some 200 miles to the SW).