Imperial County is a county located on the southeast border of the U.S. state of California. As of the 2020 census, the population was 179,702, making it the least populous county in Southern California. The county seat and largest city is El Centro. Imperial is the most recent California county to be established, as it was created in 1907 out of portions of San Diego County.
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 Little San Bernardino Mountains are a short mountain range of the Transverse Ranges, located in southern California in the United States. They extend for approximately 40 mi (64 km) southeast from the San Bernardino Mountains through San Bernardino and Riverside Counties to near the northeast edge of the Salton Sink and Salton Sea.
The Laguna Mountains are a mountain range of the Peninsular Ranges System in eastern San Diego County, southern California. The mountains run in a northwest/southeast alignment for approximately 35 miles (56 km).
Palomar Mountain is a mountain ridge in the Peninsular Ranges in northern San Diego County. It is famous as the location of the Palomar Observatory and Hale Telescope, and known for the Palomar Mountain State Park.
The Cleveland National Forest encompasses 460,000 acres/720 sq mi (1,900 km2) of inland montane regions—approx. 60 miles from the Pacific Ocean—within the counties of San Diego, Riverside, and Orange, California. The landscape varies somewhat, with mostly chaparral canyons, arroyos and high desert, but dotted with meadows and oak and conifer forests. Near water sources, riparian environments and perennial aquatic plants attract native and migratory wildlife, such as at San Diego’s man-made Lake Cuyamaca. A generally warm and dry, inland-Mediterranean climate prevails over the forest, with the cooler months producing morning frost and snowfall. It is the southernmost U.S. National Forest of California. The area is administered by the U.S. Forest Service, a government agency within the United States Department of Agriculture, and is locally overseen by the Descanso, Palomar and Trabuco Ranger Districts.
The Dead Mountains are a mountain range in the southeastern Mojave Desert, in San Bernardino County, California. The range borders the tri-state intersection of Nevada, Arizona and California, and the Mohave Valley, with the Fort Mojave Indian Reservation bordering the range foothills on the east and northeast, in the three states.
The Jacumba Mountains are a mountain range of the Peninsular Ranges system, located in eastern San Diego County, Southern California, near the U.S. border with Mexico.
The Stepladder Mountains are located in southeastern California in the United States. The range, found in San Bernardino County, is home to the 84,199-acre (approximate) Stepladder Mountains Wilderness, which protects the Desert tortoise, California's state reptile. The mountains are located east of the Old Woman Mountains and north of the Turtle Mountains, about 29 miles (47 km) southeast of the town of Essex.
The Bigelow Cholla Garden Wilderness is in the eastern Mojave Desert and within Mojave Trails National Monument, located in San Bernardino County, California.
Cuyamaca Peak is a mountain peak of the Cuyamaca Mountains range, in San Diego County, Southern California.
Blue Angels Peak is a mountain located in the Sierra Juárez mountains less than 300 yards (270 m) north of the United States-Mexico border in California. The mountain rises to an elevation of 4,552 feet (1,387 m) near the San Diego-Imperial county border and Interstate 8. Despite its relatively low elevation, the summit of Blue Angels Peak is the highest point in Imperial County. A 500 kV power line, an extension of Path 46 into San Diego, traverses the northern foothills of this mountain.
Hot Springs Mountain is a peak located in the Peninsular Ranges in California. The mountain rises to an elevation of 6,533 feet (1,991 m) and is the highest point in San Diego County. Some snow falls on the mountain peak during winter. It is located in a remote region of the county, 4 miles from the community of Warner Springs, 12 miles from Borrego Springs, and 50 miles from San Diego. The mountain and its immediate surroundings belong to the Los Coyotes Band of Cahuilla and Cupeno Indians. The summit and fire tower can be hiked via the Sukat Road route from the campground. Hikers and campers must pay an entry fee to access the area.
The Coyote Mountains are a small mountain range in San Diego and Imperial Counties in southern California. The Coyotes form a narrow ESE trending 2 mi (3.2 km) wide range with a length of about 12 mi (19 km). The southeast end turns and forms a 2 mi (3.2 km) north trending "hook". The highest point is Carrizo Mountain on the northeast end with an elevation of 2,408 feet (734 m). Mine Peak at the northwest end of the range has an elevation of 1,850 ft (560 m). Coyote Wash along I-8 along the southeast margin of the range is 100 to 300 feet in elevation. Plaster City lies in the Yuha Desert about 5.5 mi (8.9 km) east of the east end of the range.
The San Felipe Hills are a low mountain range in eastern San Diego County, southern California.
The Santa Rosa Wilderness is a 72,259-acre (292.42 km2) wilderness area in Southern California, in the Santa Rosa Mountains of Riverside and San Diego counties, California. It is in the Colorado Desert section of the Sonoran Desert, above the Coachella Valley and Lower Colorado River Valley regions in a Peninsular Range, between La Quinta to the north and Anza Borrego Desert State Park to the south. The United States Congress established the wilderness in 1984 with the passage of the California Wilderness Act, managed by both the US Forest Service and the Bureau of Land Management. In 2009, the Omnibus Public Land Management Act was signed into law which added more than 2,000 acres (8.1 km2). Most of the Santa Rosa Wilderness is within the Santa Rosa and San Jacinto Mountains National Monument.
San Diego County, officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the fifth-most populous in the United States. Its county seat is San Diego, the second-most populous city in California and the eighth-most populous city in the United States. It is the southwesternmost county in the 48 contiguous United States, and is a border county. It is also home to 18 Native American tribal reservations, the most of any county in the United States.
Los Coyotes Band of Cahuilla and Cupeño Indians of the Los Coyotes Reservation is a federally recognized tribe of Cahuilla and Cupeño Indians, who were Mission Indians located in California.
San Felipe Creek is a stream in Imperial and San Diego Counties of California. It arises in the Volcan Mountains of San Diego County 33°11′57″N116°37′35″W, and runs eastward, gathering the waters of most of the eastern slope of the mountains and desert of the county in the San Sebastian Marsh before it empties into the Salton Sea. It is probably the last remaining perennial natural desert stream in the Colorado Desert region. In 1974, the San Felipe Creek Area was designated as a National Natural Landmark by the National Park Service.
The 1968 Borrego Mountain earthquake occurred on April 8, at 18:28 PST in the geologically active Salton Trough of Southern California. The Salton Trough represents a pull-apart basin formed by movements along major faults. This region is dominated by major strike-slip faults one of them being the San Jacinto Fault which produced the 1968 earthquake. The mainshock's epicenter was near the unincorporated community of Ocotillo Wells in San Diego County. The moment magnitude (Mw ) 6.6 strike-slip earthquake struck with a focal depth of 11.1 km (6.9 mi). The zone of surface rupture was assigned a maximum Modified Mercalli intensity (MMI) of VII.
