Iguazú Falls — A Deep Dive
Iguazú is bigger than Niagara, taller than Niagara, and more powerful by total volume — yet it remains less known to North American travellers than its temperate counterpart. The falls are on the map.
Geology
Iguazú falls over a basalt cliff laid down by the Paraná Traps eruptions 130 million years ago. The Iguazú river drops 82 m at the Garganta del Diablo. Erosion is slow — the basalt is hard.
Two parks
Iguazú National Park (Argentina) covers the upper and lower walkways and most of the cataracts (~80% of the falls). Iguaçu National Park (Brazil) offers panoramic views of the Argentine side. Both are UNESCO.
Garganta del Diablo
The U-shaped 'Devil's Throat' is the centrepiece — 82 m tall and 150 m wide. Half the river's flow falls here. An elevated walkway from the upper park's train terminus brings visitors right to the edge.
Wildlife
Coatis, capuchin monkeys, butterflies (over 800 species), toucans, great dusky swifts (nesting behind the falls), caimans on the lower river. Jaguars elusive but present.
Visiting practicalities
Stay 2 nights minimum: one for Argentine side, one for Brazilian. Both sides have entry fees (~USD 25 each in 2024). Crossing the border requires passport and possibly visa depending on nationality.
Best season
Year-round: high flow January-February (summer rain) but very humid; lower flow August-September (winter dry) with clearer skies. Avoid Brazilian and Argentine school holidays for fewer crowds.
Logistics
Closest airports: Puerto Iguazú (IGR, Argentina) and Foz do Iguaçu (IGU, Brazil). Daily flights from Buenos Aires and São Paulo. Triple-border excursions to Ciudad del Este (Paraguay) common but not necessary.
Where will you go first?
All of these are pinned on our interactive map.