Triple Frontier, International tripoint in South America.
The Triple Frontier is an international tripoint in South America where the Iguazú River flows into the Paraná and the territories of Argentina, Brazil, and Paraguay converge. The marker appears on the shores of the three border cities of Puerto Iguazú, Foz do Iguaçu, and Ciudad del Este, with each country maintaining its own viewpoint along the wide, slow-moving water.
The three nations established their shared borders in 1903 through diplomatic agreements, formally recognizing the area as an international boundary zone. Earlier disputes over the exact dividing lines had been resolved through bilateral negotiations in the decades before.
The confluence brings together three countries with different languages and daily rhythms, where visitors can easily sense the shift between Spanish-speaking Argentina, Portuguese-speaking Brazil, and bilingual Paraguay. Each side maintains its own habits around food, opening hours, and riverfront architecture, making the transition between territories noticeable.
Ferry connections run between the three cities and provide direct access to the viewpoints on each side, with crossings typically taking under an hour. Visitors should carry travel documents, as movement between countries involves border crossing.
The region sits above the Guarani Aquifer, one of the largest underground freshwater reserves in the world, stretching beneath all three countries. Most of this hidden water system lies under Brazilian soil.
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