From a Fodor’s online article:

Surrounded by rugged cliffs high in the Chisos Mountains, Big Bend National Park’s Chisos Basin Campground is a picturesque slice of montane shrubland, featuring Arizona Cypress and desert-hearty mesquite trees. Chisos Campground is positioned close to the park’s most popular trails, including the Lost Mine Trail and Pinnacles Trail, and its highest point, Emory Peak. Almost half of the campground’s 60 sites can be reserved in advance (November to May) and 18 of them (non-reservable) allow the use of a generator. All sites have grills instead of fire pits, and the campground is replete with flush toilets and drinking water.