The North Algodones Dunes Wilderness encompasses more than 26,000 acres. Other specially designated areas found within this wilderness include the Imperial Sand Hills National Natural Landmark and the Algodones Outstanding Natural Area. The Wilderness is divided into two distinct zones. On the west side are the primary dunes, the largest and tallest dunes composed of relatively coarse sand. On the east are the secondary dunes, smaller and composed of generally finer sands carried further east by prevailing winds. A parking area with access to the wilderness site is a perfect place to discover a variety of plant and animal species. Visitors are welcome to walk or ride horses in this remote area. The wilderness is closed to all vehicles and mechanized use.