West Virginia, United States
Third Hill Mountain is located in Berkeley County, West Virginia in the Eastern Panhandle. Third Hill Mountain reaches its highest elevation of 2,172 feet (662 m) above sea-level southeast of the "Locks-of-the-Mountain" where it "locks" with Sleepy Creek Mountain.
Together with Sleepy Creek Mountain, the two mountains contain between them Sleepy Creek Lake and the Sleepy Creek Wildlife Management Area. Sleepy Creek and Third Hill Mountains are distinctive for their height in the relatively level terrain of the far Eastern Panhandle region of West Virginia.