List of metropolitan areas that overlap multiple countries

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Here is a list of metroplexes that overlap multiple countries:

Excluded from list is:

City-states being part of the overlap. One example of that would be Rome since Vatican City is isolated within Italy.

Between the United States and Canada

This list is from west to east:

Milan metropolitan area, Italy extends into Canton Ticino, Switzerland
Basel metropolitan area, Switzerland extends into France and Germany
Metropolitan Bratislava overlaps Slovakia, Hungary and Austria
Strasbourg, France and Kehl, Germany
Maastricht, Netherlands and Liège, Belgium and Aachen, Germany
Copenhagen, Denmark and Malmö, Sweden
Brăila-Galaţi (Cantemir) Metropolitan Area extends over Danube and Prut, including the Republica Moldova's urban area of Cantemir-Cahul
Subotica, Serbia and Szeged, Hungary- urban sprawl between the 2 close cities
Lille, France and Mouscron and Kortrijk, Belgium
Metropolitan Geneva extends into France.
Metropolitan Luxembourg City extends into Belgium, France, and Germany
Iaşi Metropolitan Area extends over Prut, including cities like Ungheni from Republica Moldova
Frankfurt/Oder of Germany and Slubice of Poland are one city divided by the river Oder
Görlitz of Germany and Zgorzelec of Poland are one city divided by the river Nysa
Cieszyn in Southern Poland and Český Těšín in the Czech Republic are one city divided by the Olza River
Salzburg in Austria extends to Germany
Gorizia in Italy and Nova Gorica in Slovenia
Komárno in Slovakia and Komárom in Hungary

Aqaba, Jordan; Eilat, Israel; and Taba, Egypt
Rivera, Uruguay, and Santana do Livramento, Brazil
Livingstone, Zambia, and Victoria Falls, Zimbabwe
The city of Lome, the capital of Togo, extends over the border to Ghana
The capital of Laos, Vientiane, spills over the Thai–Lao Friendship Bridge (Saphan Mittaphap) to Nong Khai province, Thailand
Singapore together with Johor Bahru in Malaysia and Riau Islands in Indonesia, also called the Sijori Growth Triangle.
Ciudad del Este in Paraguay, Foz do Iguaçu in Brazil and Puerto Iguazu in Argentina, also called Triple Frontera or the Tri Border.
The Tres Fronteras metropolitan area of Tabatinga in Brazil, Leticia in Colombia, and Santa Rosa in Peru form a metropolitan area of nearly 100,000 people.
The cities of Tacna, Peru, and Arica, Chile, form a combined metropolitan population of over 500,000 people.