Okay BLM site. Campsites are scattered along the dirt road. I have no idea how far the little narrow dirt road goes, but as long as you can find a place to park, I think your good. Quite dense with cactus and many of the sites are kind of pull throughs. Biosphere II is about 28 miles to the east, so it was a good spot to camp at for free and then drive to my tour in the AM.