Black Rock Mountain State Park is a 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 , the park provides many scenic overlooks and 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 in elevation, making it the state's highest state park. As of 2019, it was open to visitors year round. History Most of the rock outcrops found throughout the park are made of biotite gneiss, a metamorphic rock that underlies a large portion of the Georgia Blue Ridge. Black Rock Mountain State Park was established in 1952 and originally consisted of . Before the park was established, Rabun County native John V. Arrendale began assembling the area that would later become the park, making his first purchase in 1938. Numerous purchases have added to the park's area, including added in 1995 with funding received from then-Governor Zell Miller's Preservation 2000 land acquisition program. Several smaller acquisitions have added acreage to the park's southwest corner. Climate Hiking and camping There are five hiking trails through forests, alongside mountain streams and around Black Rock Lake. The Tennessee Rock Trail crosses Black Rock Mountain's north slope before climbing across the mountain's summit and following the Eastern Continental Divide. From the trail's namesake feature, Tennessee Rock, vistas can be seen that extend northward into the Great Smoky Mountains National Park, including Clingman's Dome, the highest point in Tennessee. The James E. Edmonds Trail is named for "Mr. Eddie" Edmonds, one of the park's earliest and longest-serving rangers. This rugged trail features four secluded campsites that allow backpackers with reservations to escape into the park's quiet backcountry. The campsites are undeveloped and offer no facilities. In places the Edmonds Trail weaves in and out of laurel-filled coves and follows mountain streams with small waterfalls. At the trail's northern end, there are Lookoff Mountain and views of Wolffork Valley, the source of the Little Tennessee River. The Ada-Hi Falls Trail is named for the Cherokee word for "forest". The quarter-mile trail begins near the entrance of the park's RV camping area and leads into a moist north-facing cove filled with