What is this area named?

The Triple Frontier (Spanish: Triple Frontera, Portuguese: Tríplice Fronteira) is a tri-border area along the junction of Paraguay, Argentina and Brazil, where the Iguazú and Paraná rivers converge. Near the confluence are the cities of Ciudad del Este (Paraguay); Puerto Iguazú (Argentina) and Foz do Iguaçu (Brazil). This area is near Iguazú Falls and the Itaipú hydroelectric plant.

The Triple Frontier is an important tourist area, within the touristic subregion of the Región de las Aguas Grandes. Visitors can see the Tancredo Neves bridge, which connects the Argentine city of Puerto Iguazú and its Brazilian neighbor, Foz do Iguaçu. At the convergence of the borders, each of the three bordering countries has erected an obelisk, painted in the national colors of the country in which it is located. All three countries can be seen from each of the obelisks.

The Guarani Aquifer is arguably the biggest reservoir of fresh, potable water in the world—right under Triple Border soil (Brazil, Argentina and Paraguay). The majority (71%) of its 1.2 million square kilometers lies in Brazil.