The Santa Rosa and San Jacinto Mountains National Monument is a National Monument in Southern California. It includes portions of the Santa Rosa and San Jacinto Mountain ranges, the northernmost ones of the Peninsular Ranges system. The national monument covers portions of Riverside County, west of the Coachella Valley, approximately 100 miles (160 km) southeast of downtown Los Angeles.
The Agua Caliente Band of Cahuilla Indians own substantial acreage within the monument, are one of the managing agencies, and have historic cultural sites and interests throughout the mountains.More than 200 cultural resources have been recorded on federally-managed lands within the monument including the Martinez Canyon Rockhouse, which is listed on the National Register of Historic Places.
The monument is oriented northwest to southeast along the edge of the broad Coachella Valley, and the terrain rises sharply from below sea level to nearly 11,000 feet (3,400 m). These mountains are a part of the Peninsular Range Province, which extends from the Baja Peninsula in Mexico to San Jacinto Mountains in California. San Jacinto Peak is the highest point in the Peninsular Range Province and has one of the steepest fault-block escarpments in North America.