Site 66 is a primitive campsite within Green Ridge State Forest near the Potomac River and C&O Canal, accessible via a rough gravel road that requires high clearance vehicles.

The site features a picnic table and fire ring with nearby trail access to the Potomac River shoreline, making it suitable for paddlers and anglers seeking a remote camping base.

At $10/night with first-come, first-served availability, it offers secluded camping for those willing to navigate challenging road conditions to reach the location.