Mountain Bridge Wilderness Area, South Carolina.
The Jones Gap Trail is 5.3 miles long and runs from Jones Gap State Park to Caesars Head State Park. With a little added road running up HWY 276 to the NC state line, I stretched this out-and-back run to about 13 miles. Jones Gap State Park is fairly popular, and once the parking lot is full the rangers will begin to limit access. I got there pretty early and avoided having to wait. Another option is to get on the trail from the Caesars Head side, which has ample parking. The trail here is super technical and several creek crossings almost guarantee wet feet. It is entirely uphill from Jones Gap which makes for a super fun 5 mile downhill on the return trip.