Transborder agglomeration

San Diego–Tijuana is an urban agglomeration across the Mexico–United States border.

Urban agglomeration or conurbation that extends into multiple sovereign states and/or dependent territories.

- Transborder agglomeration

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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.

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 economic center of the San Diego–Tijuana conurbation, the second most populous transborder metropolitan area in the western hemisphere (after Detroit–Windsor), home to an estimated 4,922,723 people as of 2012.


Capital and largest city of Chad.

A street of N'Djamena in 1952
Astronaut's view of N’Djamena
Festival Dary
The Chad National Museum and the National Library of Chad in N'Djamena
Christian churches
National Assembly of Chad

It is a port city located at the confluence of the Logone River with the Chari River, forming a transborder agglomeration with the city of Kousséri (in Cameroon), capital of the Department of Logone-et-Chari, which is on the west bank of both rivers.

Metropolitan area

Region consisting of a densely populated Urban Agglomeration and its surrounding territories sharing industries, commercial areas, transport network, infrastructures and housing.

Satellite imagery showing the New York metropolitan area at night. Long Island extends to the east of the central core of Manhattan.

List of metropolitan areas that overlap multiple countries

Ciudad Juárez

Ciudad Juárez (Juarez City.

A painting of the Guadalupe Mission in the 1850s. The Presidio del Paso del Rio Norte can be seen to the right in the far background.
Juárez mission and cathedral
Benito Juárez monument located in central Juárez
Taft and Díaz, historic first presidential summit, Ciudad Juárez, Mexico, 1909
View of the Plaza de la Mexicanidad in north central Juárez
Skyline of Ciudad Juárez
Replica of the Arc de Triomphe marking the entrance of the exclusive Campos Elíseos residential community. In the background, Hospital Ángeles
Satellite picture of Ciudad Juárez and El Paso
Going into Mexico from El Paso
Crosses erected as a monument to victims of the Juárez femicides in front of the student union at the University of Utah
Chart showing decline in the murder rate. Source:
View of El Paso from the Ciudad Juárez side of the border
Monterrey Institute of Technology and Higher Education at Ciudad Juárez

Together with the surrounding areas, the cities form El Paso–Juárez, the second largest binational metropolitan area on the Mexico–U.S. border (after San Diego–Tijuana), with a combined population of over 2.7 million people.

Nogales, Arizona

City in Santa Cruz County, Arizona.

The boundary between Nogales, Arizona, in the United States, on the left, and Nogales, Sonora, in Mexico, on the right, running down the center of a wide avenue, about 1899
Similar picture of the border, 2007

Nogales forms Arizona's largest transborder agglomeration with its adjacent, much larger twin Nogales, Sonora, across the Mexican border.


City in Far North Province, Cameroon.

Chari river, from Kousseri
Chari river, in Central Africa, separates N'Djamena, in Chad, from Kousseri in Cameroon
Trade on Logone river

It forms a transborder agglomeration with the city of N'Djamena, capital of Chad, from which it is separated by the Logone River and the Chari River.

Lists of cities

List of lists of places:

Tokyo is widely considered the world's largest city (by urban area and metropolitan area). The satellite image shows that its urbanization has exceeded its city limits.

List of metropolitan areas that overlap multiple countries


Detroit skyline to the right and Windsor to the left of the Detroit River
Casino Windsor (now Caesars Windsor) was a major contributing factor to Detroit's legalization of casino gaming.

The Detroit–Windsor region is an international transborder agglomeration comprising the American city of Detroit, Michigan, the Canadian city of Windsor, Ontario, and the Detroit River between them.

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 
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.

List of satellite cities by population

List of the largest satellite cities worldwide, with over 500,000 people.

Taoyuan (pictured above; 2.3 million) is the satellite city of Taipei (7 million). Many of the former's residents work in and commute to the latter.

Excluded are transborder agglomerations.