The U.S. Bureau of Land Management (BLM) manages public lands in the Mojave Desert as part of its "crown jewels of the American West" National Landscape Conservation System. It has designated numerous large off-road vehicle open use areas on public lands in the western Mojave Desert, including El Mirage, Jawbone Canyon, Rasor, Spangler Hills, Stoddard Valley, Dove Spring Canyon, Dumont Dunes, and the world's largest open off-road vehicle use area, Johnson Valley. Open areas designated for unrestricted vehicle travel in the western Mojave Desert total . Several additional open areas dedicated to unrestricted vehicle travel on public lands have been designated in the northern and eastern Colorado (NECO) Desert. In 2002, BLM designated all washes in the southeastern third of the NECO planning area as also open to unrestricted vehicle travel. This was followed in 2003 by BLM expanding the off-road vehicle network in the western Mojave Desert to enhance off-road vehicle recreation opportunity. In 2004, relative to the case of "Center for Biological Diversity, et al., Plaintiffs, v. Bureau of Land Management, et al., Defendants"; the United States District court enjoined "all off-road vehicle use in the washes of the NECO Desert planning area pending issuance of a new biological opinion.".a. </ref> A new biological opinion was subsequently issued and BLM's open wash designation in the NECO planning area was reinstated. In 2006, several environmental groups protested an additional route network expansion designated under the West Mojave Desert (WEMO) plan.