Black Rock Mountain State Park is a 1,743-acre (705 ha) Georgia, United States, state park west of Mountain City in Rabun County, in the Blue Ridge Mountains. It is named after its sheer cliffs of dark-colored biotite gneiss. Astride the Eastern Continental Divide at an elevation of 3,640 feet (1,110 m), the park provides many scenic overlooks and 80-mile (130 km) vistas of the southern Appalachian Mountains. On a clear day, four states are visible: Georgia, North Carolina, South Carolina, and Tennessee. In addition to Black Rock Mountain itself, the park includes four other peaks over 3,000 feet (910 m) in elevation, making it the state's highest state park. As of 2019, it was open to visitors year round.