If you stood in a boat at exactly the right spot on the river, you could wave to people in three different countries at the same time. Each country has its own town on its own bank: Ciudad del Este (Paraguay), Puerto Iguazú (Argentina), and Foz do Iguaçu (Brazil). Every day, thousands of people cross the bridges between them to shop, work, or visit family.
The spectacular Iguazú Falls are just upstream on the Argentine-Brazilian border, and mist from the falls sometimes drifts as far as the Paraguay side on windy days. The whole area is surrounded by subtropical jungle full of toucans, caimans, and giant river otters.
The Triple Frontier is a great reminder that rivers do not divide people - they connect them. Boats, bridges, and ferries link the three sides, and the mix of Spanish, Portuguese, and Guaraní languages you can hear in the streets is like no place else on the planet.