Black Rock Mountain State Park is a 1,743 acre (7.03 km²) Georgia state park located west of Mountain City in Rabun County, Georgia. It is named after its sheer cliffs of dark-colored biotite gneiss in Georgia's Blue Ridge Mountains. Located astride the Eastern Continental Divide at an elevation of 3,640 feet (1,109 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.