Mojave National Preserve is located in the Mojave Desert, California. At 1.6 million acres, it is the third largest unit of the National Park System in the contiguous United States. Natural features include the Kelso Dunes, the Marl Mountains and the Cima Dome, as well as volcanic formations such as Hole-in-the-Wall and the Cinder Cone Lava Beds.br/br/Impressive Joshua Tree forests cover parts of the preserve. The Cima Dome and Shadow Valley forests are the largest in the world. The preserve is commonly traversed by 4 wheel drive vehicles traveling on the historic Mojave Road.