Gap Tank is located in the gap between Mt. Riley and the E. Potrillo Mountain ridge in the Desert Peaks National Monument on BLM land in the Chihuahuan Desert. Very few people out there. Very primitive. No campground. Little to no shade. I’ve camped here twice in my truck bed—once in 2017 when I climbed Mt. Riley and once in 2020. Close to Mexican border but I didn’t have any problems. Probably not conducive to RVs because difficult to pull off county road.