Rocky Knob Recreation Area-Mileposts 165.3–169.0 Professional Review and Guide
"Like Doughton Park in North Carolina (Mileposts 238–245), Virginia’s 3,589-acre Rocky Knob Recreation Area is a backcountry bulge from the Parkway that contains a trail system extensive enough to permit backpack camping. But unlike Doughton, with its various circuit hiking options, the 10.6-mile Rock Castle Gorge Trail is simply one big loop.
That makes it a strenuous day hike (except in sections). At first glance, backpacking trips seem similarly difficult, largely because the logical place to start, in the valley, is the location of the backcountry campsite where you should be ending up after a
day on the trail."