Mojave National Preserve is a United States National Preserve located in the Mojave Desert of San Bernardino County, California, USA, between Interstate 15 and Interstate 40. The preserve was established October 31, 1994 with the passage of the California Desert Protection Act by the US Congress. Previously, it was the East Mojave National Scenic Area, under the jurisdiction of the Bureau of Land Management. Mojave National Preserve is vast. At 1,600,000 acres (650,000 ha), 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. The preserve encloses Providence Mountains State Recreation Area and Mitchell Caverns Natural Preserve, which are both managed by the California Department of Parks and Recreation.Impressive Joshua Tree forests cover parts of the preserve. The Cima Dome and Shadow Valley forests are the largest in the world. The ghost town of Kelso is found in the preserve, with the defunct railroad depot serving as the Visitor Center. The preserve is commonly traversed by 4 wheel drive vehicles traveling on the historic Mojave Road.