The Marine Corps Air Ground Combat Center (MCAGCC) is located in the southern Mojave Desert, one of the hottest and driest deserts in North America. It is the U.S. Marine Corps' largest training facility, occupying approximately 935 square miles (598,400 acres).

The data presented here is from the Natural Resources and Environmental Activities Branch on Twentynine Palms. It comprises GIS data, Environmental Data, and Cultural and Resource data. There are also a number of online documents based on environmental research done on the base.