Guides.

Imperial Sand Dunes Recreation Area

Imperial Sand Dunes is the largest mass of sand dunes in California, a 40-mile-long dune complex in the southeast corner of the state east of Brawley and west of Yuma, Arizona. The recreation area is split into an open OHV zone south of State Route 78, a designated-route zone in the middle, and the 26,000-acre North Algodones Dunes Wilderness to the north where motorized travel is prohibited.