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This rugged county is the westernmost county in Maryland, closer to Pittsburgh, Pa., than to Annapolis. County seat is Oakland, near Deep Creek Lake (not in the Potomac River Valley). The county is named for John Work Garrett, president of the B&O Railroad. The county is bounded by the Pennsylvania state line to the north, Allegany County to the east, the North Branch Potomac River to the south, and the West Virginia line to the west. Principal towns are Friendsville, Grantsville, Oakland, and Mountain Lake Park. The highest point in Maryland is on Backbone Mountain (3360 feet), near the Fairfax Stone, the source of the Potomac.