Playas de Tijuana.
San Diego Marina district
Downtown Tijuana in the 1920s.
Sunset in Venice, a neighborhood in Los Angeles
Álvaro Obregón School in 1930.
Three Arch Bay in Laguna Beach
The Jai Alai arena, built in 1947, attracted spectators from both sides of the border.
California counties below the 36th standard parallel
Agua Caliente Casino in 1951.
Topography of the border region
San Francisco de Asís Church, built in 1959.
Percent of households with incomes above $150k across LA County census tracts.
The number of skyscrapers and high rises in Tijuana has grown significantly in the 21st century.
Köppen climate types of southern California
View of the Cerro San Isidro from across the valley from Cerro Colorado.
Proctor Valley in Chula Vista
Sunset in Playas de Tijuana.
Autumn of 2008 in southern California.
Teniente Guerrero Park.
Satellite view of southern California, including the Channel Islands
View of Downtown Tijuana.
View from La Jolla Cove in San Diego.
View down Paseo de los Héroes of the Abraham Lincoln Monument.
Peaks in the eastern San Gabriel Mountains, Angeles National Forest, San Bernardino County.
Skyscrapers on Blvd. Agua Caliente.
Yucca Valley with Visitor Center in Background in June 2017.
The Mexico–United States barrier at the Pacific Coast.
Ocean Beach Sunset in San Diego.
The ocean in Playas de Tijuana.
Northridge earthquake shake map
Cerro San Isidro covered in snow.
Salton Sea in the Coachella Valley
The Tijuana Mexico Temple is a temple of the Mormon Church.
The Oceanside Pier on the San Diego County coast
Our Lady of Guadalupe Cathedral of the Catholic Archdiocese of Tijuana.
Downtown San Bernardino
Imaculada Concepción Church.
Taco Bell Headquarters in Irvine
Monument to Ignacio Zaragoza.
Disneyland in Anaheim
The Palace of Government of Tijuana Municipality.
Interstate and state highway system of Southern California
View of the Zona Río.
The Atchison, Topeka and Santa Fe Railway's combined Super Chief-El Capitan pulls into Los Angeles's Union Passenger Terminal on September 24, 1966.
Restaurants on Avenida Revolución.
University of California, Los Angeles
Market in Downtown Tijuana.
California Institute of Technology
Plaza Santa Cecília decorated with traditional Mexican papel picado.
Excel Medical Center.
Tijuana has grown in the 21st century as a significant commercial and manufacturing center of North America.
Autonomous University of Baja California, Tijuana (UABC).
View of Avenida Revolución.
Tijuana Cultural Center is an arts center and home to the Museum of The Californias.
The Tijuana Arch, in Zona Centro.
Caesar salad was invented at Caesar's in the 1920's.
Casa de la Cultura de Tijuana.
View of Tijuana's Zona Centro.
Señor de Misericordia Church.
A Norteño musical ensemble performing in Downtown Tijuana.
The 18 de Marzo Memorial.
Estadio Caliente, home to Club Tijuana of the Liga MX.
Estadio Chevron
Tijuana International Airport.
Vía Rápida in Tijuana.
Amistad bus rapid transit station.
A Tijuana BRT bus.
Cristo de los Álamos statue.

Southern California includes the heavily built-up urban area which stretches along the Pacific coast from Ventura through Greater Los Angeles down to Greater San Diego (the contiguous urban area in fact continuing into Tijuana, Mexico), and inland to the Inland Empire and Coachella Valley (Palm Springs area).

- Southern California

The Tijuana River is an intermittent river, 195 km long, on the Pacific coast of northern Baja California in Mexico and Southern California in the United States.

- Tijuana

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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.

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 primary border crossing between San Diego and Tijuana, the San Ysidro Port of Entry, is the busiest international land border crossing in the world outside of Asia (fourth-busiest overall).

Like much of Southern California, the majority of San Diego's current area was originally occupied on the west by coastal sage scrub and on the east by chaparral, plant communities made up mostly of drought-resistant shrubs.

Baja California

State in Mexico.

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.

Over 75% of the population lives in Mexicali (the state's capital city), Ensenada, or Tijuana (the state's largest city).

These ranges are the location of forests reminiscent of Southern California's San Gabriel Mountains.

Tijuana River

Tijuana River seen from a pedestrian bridge in Tijuana (Mexico).
The Tijuana River Estuary.
Warning sign at Border Field State Park in December 2014

The Tijuana River (Río Tijuana) is an intermittent river, 120 mi (195 km) long, near the Pacific coast of northern Baja California state in northwestern Mexico and Southern California in the western United States.

The river is heavily polluted with raw sewage from the city of Tijuana, Mexico.

San Diego–Tijuana

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

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

The majority of cross-border trips into the United States are those made by commuters into the Greater San Diego area and Southern California as a whole.