... embraces the counties of Augusta, Rockingham, Shenandoah, Page, Warren, Clarke, Frederick, Jefferson and Berkeley. This valley is bounded on the north by the Potomac, on the south by the county of Rockbridge , on the east by the Blue Ridge and on the west by the Great North Mountain and its ranges. The Shenandoah River is composed of two branches, called, respectively, the North Fork and the South F...