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

A transborder agglomeration is an urban agglomeration or conurbation that extends into multiple sovereign states and/or dependent territories. It includes city-states that agglomerate with their neighbouring countries.

List of transborder agglomerations

Africa

Main municipalitiesCountriesTotal population
Kinshasa–BrazzavilleDemocratic Republic of the Congo /Republic of the Congo19,547,463
Bukavu–CyanguguDemocratic Republic of the Congo / Rwanda1,200,000
Goma–Gisenyi756,323
Abidjan–LagosCôte d'Ivoire / Ghana / Togo / Benin / Nigeria27,000,000
Lomé–AflaoTogo / Ghana1,544,206
N'Djamena–KoussériChad / Cameroon1,694,819

Asia

Main municipalitiesCountriesTotal population
Astara and AstaraIran–Azerbaijan100,000
Khorramshahr–Abadan–BasraIran–Iraq2,000,000
Dhahran–Jubail–ManamaSaudi Arabia–Bahrain2,000,000
Tashkent–SaryagashUzbekistan–Kazakhstan3,000,000
Fergana and Kyzyl-KiyaUzbekistan–Kyrgyzstan300,000
Qorasuv and Kara-Suu40,000
Heihe–BlagoveshchenskChina–Russia400,000
Dandong–SinuijuChina–North Korea1,000,000
Greater Bay Area (Guangzhou–Dongguan–Shenzhen–Hong Kong–MacauChina–Hong Kong–Macau71,200,000
Sijori Growth Triangle (Singapore–Johor Bahru–Batam–Bintan)Singapore–Malaysia–Indonesia9,000,000
Padang Besar and Padang BesarMalaysia–Thailand20,000
Vientiane–Nong KhaiLaos–Thailand900,000
Al Ain and Al-BuraimiUnited Arab Emirates–Oman968,589
Savannakhet–MukdahanLaos–Thailand200,000

Europe

Main municipalitiesCountriesTotal population[citation needed]
Øresund Region (Greater Copenhagen and Malmö)Denmark–Sweden3,964,522
Haparanda–TornioSweden–Finland32,000
Pello (Pello, Övertorneå and Pello, Finland)4,500
Karesuando–Karesuvanto500
Imatra and SvetogorskFinland–Russia45,000
Ivangorod–NarvaRussia–Estonia69,000
Valga–ValkaEstonia–Latvia20,000
Como–Chiasso (part of Greater Milan)Italy–Switzerland189,000
Gorizia–Nova GoricaItaly–Slovenia
Basel–Huningue–Weil am Rhein (Trinational Eurodistrict of Basel)Switzerland–France–Germany2,400,000
Geneva–Annemasse–Ferney-Voltaire–Nyon (Grand Genève)Switzerland–France890,000
Kreuzlingen–KonstanzSwitzerland–Germany110,000
Basque Eurocity Bayonne-San SebastiánFrance–Spain620,000
Le Perthus–Els Límits700
Bourg-Madame–Puigcerdà
Hendaye–Irun
Lille–Roubaix–Tourcoing–Mouscron–Tournai–Kortrijk (Eurometropolis Lille–Kortrijk–Tournai)France–Belgium1,850,000
Longwy–Aubange–PétangeFrance–Belgium–Luxembourg80,000
Strasbourg–Kehl (Strasbourg-Ortenau Eurodistrict)France–Germany700,000
Forbach–Saarbrücken700,000
Monaco–Beausoleil–Cap-d'AilMonaco–France55,344
La Línea de la Concepción–GibraltarSpain–Gibraltar95,628
Baarle (Baarle-Hertog–Baarle-Nassau)Belgium–Netherlands9,262
Görlitz–ZgorzelecGermany–Poland85,000
Guben–Gubin35,000
Frankfurt (Oder)–Słubice75,000
Szczecin763,321
Cieszyn–Český TěšínPoland–Czech Republic57,000
Herzogenrath–KerkradeGermany–Netherlands95,000
Freilassing–SalzburgGermany–Austria175,000
Vienna–BratislavaAustria–Slovakia2,400,000
Komárom–KomárnoHungary–Slovakia56,000
Rousse–GiurgiuBulgaria–Romania250,000
Lifford–StrabaneIreland–United Kingdom18,500
Brod–Slavonski BrodBosnia and Herzegovina–Croatia110,000
Zvornik–Mali ZvornikBosnia and Herzegovina–Serbia70,000
Gradiška–Stara GradiškaBosnia and Herzegovina–Croatia53,000
Novi Grad–DvorBosnia and Herzegovina–Croatia30,000
Dubica–Hrvatska DubicaBosnia and Herzegovina–Croatia23,000
Kostajnica–Hrvatska KostajnicaBosnia and Herzegovina–Croatia8,000

North America

Main municipalitiesCountriesTotal population
Paso CanoasCosta Rica / Panama9,543
Metro Vancouver–Fraser Valley–Bellingham-Whatcom CountyUnited States / Canada3,350,000
Detroit–Windsor5,976,595
Buffalo-Niagara Region1,614,790
Port Huron–Sarnia–Point Edward105,776
Sault Ste. Marie–Sault Ste. Marie93,944
San Diego–TijuanaUnited States / Mexico5,105,769
Calexico–Mexicali1,143,000
San Luis Río Colorado–San Luis227,000
Nogales–Nogales240,000
El Paso–Juárez2,500,000
Laredo–Nuevo Laredo775,481
Lower Rio Grande Valley2,671,028
Reynosa–McAllen1,500,000
Brownsville–Matamoros1,387,985

South America

Main municipalitiesCountriesTotal population
Saint-Laurent-du-Maroni–AlbinaFrench Guiana / Suriname
Saint Georges–OiapoqueFrench Guiana / Brazil32,000
Quaraí–ArtigasBrazil / Uruguay67,000
Santana do Livramento–Rivera140,000
Chuí–Chuy15,592
Corumbá–Puerto SuárezBrazil / Bolivia124,000
Tabatinga–Leticia–Santa RosaBrazil / Colombia / Peru107,000
Ponta Porã–Pedro Juan CaballeroBrazil / Paraguay209,000
Foz do Iguaçu–Ciudad del Este–Puerto IguazuBrazil / Paraguay / Argentina800,000
Barracão–Dionísio Cerqueira–Bernardo de IrigoyenBrazil / Argentina36,000
Uruguaiana–Paso de los Libres170,000
Tulcán–IpialesEcuador / Colombia190,000
Cúcuta–San Antonio del TáchiraColombia / Venezuela700,000

See also