Lechuguilla Desert border of the Gran Desierto de Altar of Sonora, Mexico. The Lechuguilla Desert lies to the east-northeast of the connected ranges, Gila Mountains, and north of the Tinajas Altas Mountains, which extend southeast into north Sonora. To the west and southwest of the two ranges lies the Yuma Desert. The Tule Desert (Arizona) lies east of the Lechuguilla, and the Cabeza Prieta Mountains; all three deserts are at the northwest perimeter of the great desert, the Gran Desierto de Altar, and the Pinacate Peaks volcanic field region. Lechuguilla Desert The Lechuguilla Desert is a small desert located in southwestern Arizona
Desert bighorn sheep the population is 18,965-19,040. The results of the state-by-state survey are shown to the right. In southern California, by 1998, only 280 individuals of the peninsular bighorn sheep population remained, and that population was added to the list of the United States' most imperiled species. Populations in three southern counties had suffered greatly from disease, development, and predation. As of 2008, about 800 peninsular bighorns are believed to populate the desert backcountry from the US-Mexico border to the San Jacinto Mountains, with known populations in Anza-Borrego Desert State Park. These gains, combined with Bush Administration policies, prompted the US Fish