San Diego County, California

Many of the cities seen from the sky as part of the San Diego-Tijuana metropolitan area.
Cleveland National Forest
Beach at Border State Park; San Diego is on the right while Tijuana is on the left.
Border fence between Tijuana (right) and San Diego's border patrol offices (left)
San Onofre Nuclear Generating Station
Horton Plaza, before its demolition in 2020
San Diego County Administration Center
USS Decatur (DDG-73)
North County communities. Coastal cities are in dark blue, unincorporated coastal communities are in light blue. Inland cities are in dark yellow, unincorporated inland communities are in light yellow. Parts of northern San Diego are sometimes considered part of North County, as are much of the white areas north of the city.
East County communities in red. In dark red are the cities and towns of Santee and El Cajon which mark the western edge of East County. Unincorporated communities are in light red, including Lakeside and Alpine.
South Bay communities of San Diego County. The cities and towns of National City, Chula Vista, and Imperial Beach are in dark orange. The unincorporated community of Bonita is in light orange. San Ysidro and Otay Mesa, neighborhoods of the city of San Diego, are in pink.

County in the southwestern corner of the state of California, in the United States.

- San Diego County, California

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Marine Corps Base Camp Pendleton

Major West Coast base of the United States Marine Corps and is one of the largest Marine Corps bases in the US.

Marines hiking at Camp Pendleton during 2014
The main gate of Camp Pendleton in November 1997. This is the main road for traffic into the base. This gate has been open and staffed by military police since 9 November 2012; before that date, Marines officials used to staff here since 1942. 33.2147°N, -117.3875°W
President George W. Bush addressing Marines and sailors at Camp Pendleton in December 2004.
Wounded Warrior Chuck Sketch participates in swim practice on Feb. 14, 2012 at Camp Pendleton
An M1 Abrams breaches the obstacle belt during an amphibious exercise in 1997.
Beach Volleyball Tournament at Camp Del Mar's beach, Aug. 4, 2010

It is on the Southern California coast in San Diego County and is bordered by Oceanside to the south, San Clemente and Orange County to the north, Riverside County to the northeast, and Fallbrook to the east.

County (United States)

Administrative or political subdivision of a state that consists of a geographic region with specific boundaries and usually some level of governmental authority.

A highway sign designating the border between Nicholas and Greenbrier counties in West Virginia along a secondary road

County populations also vary widely: in 2017, according to the Census Bureau, more than half the U.S. population is concentrated in just 143 of the more than 3,000 counties, or just 4.6% of all counties; the five largest counties ordered by population are Los Angeles County, California; Cook County, Illinois; Harris County, Texas; Maricopa County, Arizona; and San Diego County, California.

Baja California

State in Mexico.

Sierra de San Pedro Mártir, with Picacho del Diablo in the center
Encelia californica growing on the Ensenada Municipality coast, typical of the California coastal sage and chaparral ecoregion
Isla Partida, part of the San Lorenzo Marine Archipelago National Park
Vineyard in the Valle de Guadalupe
Snowfall at Constitution 1857 National Park
Municipalities of Baja California in 2020
Marina del Pilar Ávila Olmeda, the governor of Baja California since 2021
Los Pioneros monument in Mexicali, dedicated to the pioneers that settled the region
Filming of Master and Commander at Baja Film Studios. Located in Rosarito, Baja Film Studios has become one of the premier production facilities with horizon tanks.

The state has an estimated population of 3,769,020 as of 2020, significantly higher than the sparsely populated Baja California Sur to the south, and similar to San Diego County, California, to its north.

Imperial County, California

County in the U.S. state of California.

Juan Bautista de Anza's famous expedition passed through the area in 1775.
Blue Angels
Mid-Winter Fair in Imperial, CA
The Algodones Dunes
Bighorn sheep at Palm Canyon in Anza-Borrego State Park
Mesquite Point at Imperial NWR
State Route 86 north of Salton City

Imperial is the most recent California county to be established, as it was created in 1907 out of portions of San Diego County.

San Diego Bay

San Diego Bay from Space
Map of San Diego Bay published in 1923 by the 11th Naval District.
Beach at Border State Park; San Diego is on the right while Tijuana, Mexico is on the left.
The Star of India
A plane flying over the Bay
San Diego Bay & Coronado Islands at sunset.

San Diego Bay is a natural harbor and deepwater port located in San Diego County, California near the U.S.–Mexico border.

Riverside County, California

County located in the southern portion of the U.S. state of California.

Yucca pines near Ryan Mountain Trail in Joshua Tree National Park
Riverside County Historic Courthouse
The 161-foot, 48-bell, carillon tower at the University of California, Riverside.

In addition, smaller, but significant, numbers of people have been moving into southwest Riverside County from the San Diego metropolitan area.

Luiseño

Drawing of Luiseño men in traditional dance regalia, by Pablo Tac (Luiseño, 1822–1844)
Luiseño basket maker outside of her home
Luiseño home in 1900 in the Temescal valley
Group of Luiseño men at Pala
Flag of the Soboba Band of Luiseño Indians
Flag of the La Jolla Band of Luiseño Indians

The Luiseño or Payómkawichum are an indigenous people of California who, at the time of the first contacts with the Spanish in the 16th century, inhabited the coastal area of southern California, ranging 50 mi from the present-day southern part of Los Angeles County to the northern part of San Diego County, and inland 30 mi. In the Luiseño language, the people call themselves Payómkawichum (also spelled Payómkowishum), meaning "People of the West."

Kumeyaay

Tribe of Indigenous peoples of the Americas who live at the northern border of Baja California in Mexico and the southern border of California in the United States.

Anthony Pico, former chairman of the Viejas Band of Kumeyaay
Engraving by Arthur Carl Victor Schott, Sorony & Co., 1857
Kumeyaay were displaced to construct the El Capitan Reservoir
Barona Resort Hotel
Valle de Guadalupe, B.C.
Kumeyaay items
Frame of an ‘ewaa
Kumeyaay coiled basket, woven by Celestine Lachapa, 19th century, San Diego Museum of Us
Kumeyaay willow storage basket at the Universidad Autónoma de Baja California cultural museum, Mexicali

The Cuyamaca complex, a late Holocene complex in San Diego County is related to the Kumeyaay peoples.

San Diego–Tijuana

International transborder agglomeration, straddling the border of the adjacent North American coastal cities of San Diego, California, United States and Tijuana, Baja California, Mexico.

San Ysidro Border Inspection Station in 1922
The Downtown San Diego skyline seen at night. At 2.1 mile long, the Coronado Bay Bridge stands as the longest bridge in the region and Southern California.
Paseo de los Heroes in Tijuana.
Fisherman at border fence, Playas de Tijuana
June Gloom over the South Coast
Torrey Pines State Reserve, home to Pinus torreyana torreyana, the sole location worldwide of the subspecies.
A leopard shark and two blacksmith chromis observed in kelp forest habitat at Birch Aquarium
Mountains and faults within and near San Diego–Tijuana
Cerro de Las Abejas.
Chula Vista Bayfront of Chula Vista, 3rd largest city in the region
Oceanside Pier of Oceanside, 4th largest city in the region
Beach at Border State Park; San Diego is on the right while Tijuana is on the left.
Border fence between Tijuana (right) and San Diego's border patrol offices (left)
Otay Mesa Port of Entry pedestrian facility
US-Mexico border crossing from the American side.
Cruise ship terminal at the Port of San Diego
An industrial park in Tijuana's outskirts
Qualcomm Corporate Headquarters
Kasatka (Shamu) performing at SeaWorld San Diego
San Diego during July 4 
fireworks
Tijuana's Cultural Center's OMNIMAX theater.
Interior of a bar in Tijuana
Avenida Revolución, one of Tijuana's prime entertainment districts.
View of San Diego skyscrapers along Harbor Drive
San Diego Trolley Blue Line heading towards Tijuana
San Diego traffic at the San Ysidro Port of Entry, the busiest international border crossing in the world
A Federal Highway in Tijuana's North.
Cabrillo Freeway (SR 163) leading into Downtown San Diego
Highway that connects Tijuana and Ensenada, locally known as "La Escénica"
Dole fruit containers at Tenth Avenue Marine Terminal. 185 million bananas were imported through the Port of San Diego each month in 2008.
Plane flying into San Diego International Airport
Front of Tijuana International Airport
Traffic at the San Ysidro Port of Entry in San Diego-Tijuana
CETYS University's post-graduate studies building.
Area codes of the metropolitan area
Sempra Corporate Headquarters in San Diego
Balboa Park
San Diego Museum of Man
Tijuana's House of Culture.
The Caesar salad finds roots in the cross border culture of 1920s American Prohibition, when San Diegans would take trips to Tijuana to legally consume alcohol. Caesar salad was invented by an Italian immigrant living in San Diego who owned a popular restaurant for drinking in Tijuana. Today, young San Diegans under 21 still cross into Tijuana for the 18 years old drinking age.
Surfers in Cardiff
Estadio Caliente
Petco Park during a Padres game

In its entirety, the region consists of San Diego County in the United States and the municipalities of Tijuana, Rosarito Beach, and Tecate in Mexico.

San Diego

Major city in the U.S. state of California on the coast of the Pacific Ocean and immediately adjacent to the Mexican border.

The Kumeyaay, also known as the Diegueño, have inhabited the area of San Diego for thousands of years.
San Diego's namesake is the 15th-century Spanish saint Didacus of Alcalá.
José María Estudillo served as commandant of the Presidio of San Diego and founded the Estudillo family, a powerful San Diego clan of Californios.
The 1846 Battle of San Pasqual was a decisive battle between American and Californio forces during the U.S. Conquest of California.
The namesake of Horton Plaza, Alonzo Horton developed "New Town," which became Downtown San Diego.
Balboa Park on the cover of a guidebook for the World Exposition of 1915
Satellite view of San Diego and Tijuana, Mexico
Mission Valley facing Northwest, taken from Arista Street. Mission Bay can be seen in the distance.
Normal Heights, a neighborhood of San Diego
San Diego skyline, seen in January 2021
Surfers at Pacific Beach
Coastal canyon in Torrey Pines State Reserve
San Diego viewed against the Witch Creek Fire smoke
Map of racial distribution in San Diego, 2010 U.S. Census. Each dot is 25 people:
A U.S. Navy vice admiral and an intelligence specialist celebrating Hispanic American Heritage Month in San Diego
USS Midway museum ship
F/A-18 Hornet flying over San Diego and the USS John C. Stennis
View on Harbor Drive
Downtown San Diego, as seen from Coronado Island
Qualcomm corporate headquarters
Official portrait of Mayor Todd Gloria
San Diego City Council chambers
San Diego Police Department car in the city center
San Diego State University's Hepner Hall
University of California, San Diego's Geisel Library, named for Theodor Seuss Geisel ("Dr. Seuss")
The Museum of Us
Petco Park, home of the Padres since 2004
I-5 looking south toward downtown San Diego
View of Coronado and San Diego from the air
Cross Border Xpress bridge from the terminal in San Diego on the right to the main terminal of Tijuana Airport on the left

The city is the county seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019.