The Smoke Hole, a rugged canyon of 1421 feet elevation, made by the South Branch of the Potomac River, extends eighteen miles to the junction with the North Fork. In Coeymans Limestone of Devonian Age, the river has carved out various formations and caves. Big Cave and Old Mines Cave, where saltpeter was made during the War Between the States, are the most noted. Smoke Hole is one of State's natural wonders.
US 220 southbound, about 1 mile from Smoke Hole Road, just north of Upper Tract Pendleton County West Virginia.
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West Virginia 
