Iguazu Falls facts: the giant border waterfall system

Iguazu Falls facts start with scale: this waterfall system is the largest in the world, and it sits on the border between Argentina and Brazil. Most of the falls lie on the Argentine side, where the river breaks into a huge line of drops.

The first European to record the existence of the falls was Álvar Núñez Cabeza de Vaca in 1541. Centuries later, the same landscape was protected inside Iguazú National Park in Argentina and Iguaçu National Park in Brazil, keeping both sides tied to the falls themselves.

Where are Iguazu Falls located?

Iguazu Falls are on the border of the Argentine province of Misiones and the Brazilian state of Paraná. Travelers can reach them from Foz do Iguaçu, Puerto Iguazú, and Ciudad del Este. Aerolíneas Argentinas also has direct flights from Buenos Aires to Iguazu International Airport, making the Argentine side a direct air entry point.

The falls are often described through their shape. Their layout resembles a reversed letter J, and the most spectacular sightseeing of Iguaçu National Park is the Iguaçu Falls, which form a 2,700-metre-wide semicircle. That curve helps explain why the whole scene feels so immense when seen from the park trails and viewpoints.

How big is the Iguazu Falls system?

Iguazu Falls are built like a staircase. The waterfalls have a staircase character formed by a two-step waterfall and three layers of basalt. Along the edge, the smaller waterfalls vary between sixty and eighty-two metres high, and there can be from 150 to 300 of them.

The left side jumps are Argentine and make up almost eighty percent of the falls. That is why most of the system is on the Argentine side, even though the river boundary ties the two countries together.

A dramatic feature of the system is the Devil’s Throat. About half of the river’s flow falls into the Devil’s Throat, which gives that section an especially powerful place within the entire cascade.

Why are Iguazu Falls protected?

The falls were not only admired; they were also defended. In 1876, André Rebouças started a campaign aimed at preserving the Iguaçu Falls. That effort came long before the national parks that now protect the area on both sides of the border.

Iguaçu National Park was created by federal decree number 1035 on 10 January 1939. Together with Iguazú National Park in Argentina, it protects the falls within a paired conservation landscape that spans two countries.

The park also drew major crowds. In 2014, it received 1,550,700 visitors, a number that shows how much attention the falls and their surroundings already commanded.

What makes Iguazu Falls unforgettable?

The answer is the combination of size, shape, and setting. The waterfall system is the largest in the world, it forms a broad semicircle, and its drops are split across a border landscape where the Argentine side carries most of the falls. The Devil’s Throat concentrates about half the river’s flow, while the smaller falls line the edge in dozens or even hundreds of separate drops.

That mix of geography and protection is what defines Iguazu Falls. A site first recorded in 1541 became a landmark with national parks on both sides, direct access from nearby cities, and a place in South America’s natural history.

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