The Fairfax Stone (1/2 Mi.E.) marking the Potomac's headwaters, was a corner of Lord Fairfax's vast estate. The line of 1736 was checked in 1746 by a survey on which Peter Jefferson, father of Thomas Jefferson, was engaged.

Marker is on Seneca Trail (U.S. 219) 0.2 miles south of Kempton Road (West Virginia Route 9), on the right when traveling north.

Courtesy hmdb.org

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