More than 85,000 acres of magnificent desert are open for off-highway exploration and recreation within the boundaries portrayed on the park map are operated by California State Parks. Outside the boundaries, to the south and east, large tracts of BLM land (U.S. Department of the Interior, Bureau of Land Management) are also open to off-highway vehicles. The western boundary and part of the northern boundary connect with the half-million acre Anza-Borrego Desert State Park, which is closed to off-highway recreation, but open to exploration by highway-legal vehicles along established primitive roads.