Santa Rosa Mountains (California) The Santa Rosa Mountains are a
short mountain range in the Peninsular Ranges system, located
east of the Los Angeles Basin and northeast of the San Diego
metropolitan area of southern California, in the Southwestern
United States. The Santa Rosa Mountains extend for approximately
30 miles (48 km) along the western side of the Coachella Valley
within Riverside, San Diego, and Imperial Counties in Southern
California. The range connects to the San Jacinto Mountains on
its northern end, where the Pines to Palms Highway—California
State Route 74, crosses them. The highest peak in the range is
Toro Peak (elevation 8,716 feet (2,657 m)), located
approximately 22 miles (35 km) south of Palm Springs, just south
of Route 74, and on the northeast side of Anza-Borrego's Upper
Coyote Canyon. The Santa Rosa Mountains are also a Great Basin
Divide landform for the Salton Sink Watershed on the east. The
southeastern reaches of the Santa Rosa Mountains were first
noted by a non-native person