Introduction
Iguazu Falls is one of the most spectacular waterfall systems on the planet. Located on the border between the Argentine province of Misiones and the Brazilian state of Parana, the falls consist of 275 individual cascades spread across nearly 2.7 kilometers of the Iguazu River.
The centerpiece is the Devil's Throat (Garganta del Diablo), a U-shaped chasm 82 meters high, 150 meters wide, and 700 meters long where the largest volume of water crashes down with staggering force. First Lady Eleanor Roosevelt reportedly exclaimed "Poor Niagara!" upon seeing Iguazu for the first time.
Geography & Formation
- Location: Argentina-Brazil border
- River: Iguazu River (tributary of the Parana)
- Width: 2,700 m (1.7 miles)
- Basalt Age: ~130 million years
Iguazu Falls formed where the Iguazu River flows over the edge of the Parana Plateau, a vast basalt formation created by volcanic eruptions during the breakup of the ancient supercontinent Gondwana approximately 130 million years ago. Tectonic uplift and river erosion gradually created the dramatic escarpment.
The falls sit within one of the largest remaining tracts of Atlantic Forest, a biome that once stretched along Brazil's entire coast but has been reduced to roughly 12% of its original extent. The falls themselves are divided by rocky islands and outcroppings into the 275 distinct cascades that give Iguazu its characteristic layered appearance.
Water Flow & Dimensions
- Average Flow: 1,756 m³/s
- Peak Flood Flow: Up to 12,800 m³/s
- Devil's Throat Height: 82 m (269 ft)
- Devil's Throat Width: 150 m
- Islands: Numerous rocky islets divide the falls
The Iguazu River's flow varies enormously with seasonal rainfall. During the wet season from November to March, the flow can surge to nearly 13,000 cubic meters per second, roughly seven times the average. At such times, the individual falls merge into a single terrifying brown torrent.
The Devil's Throat accounts for roughly half of the river's total flow. Water plunges into the chasm from three sides, creating a permanent cloud of mist that rises 150 meters above the gorge. During average flow, roughly 50% of the falls' 275 cascades are active; during peak flow, they all merge into a continuous curtain.
Surrounding Ecosystem
- National Parks: 2 (Argentine and Brazilian sides)
- UNESCO Heritage: 1984 (Argentina), 1986 (Brazil)
- Bird Species: Over 400
- Mammal Species: Over 80, including jaguars
The falls are surrounded by subtropical Atlantic Forest, one of the most biodiverse biomes on Earth. The Argentine side is protected by Iguazu National Park (67,620 hectares) and the Brazilian side by Iguacu National Park (185,262 hectares). Together they form one of the largest protected areas of Atlantic Forest remaining.
The parks are home to jaguars, ocelots, giant anteaters, tapirs, and the endangered harpy eagle. Coatis, a raccoon-like mammal, are abundant and famously bold around tourist areas. The falls' mist zones support unique communities of ferns, orchids, and bromeliads adapted to the constant humidity.
Cultural Significance
- Name Origin: Guarani: "y" (water) + "guasu" (big)
- Indigenous People: Guarani, Kaingang
- First European Sighting: 1541 (Alvar Nunez Cabeza de Vaca)
- New7Wonders of Nature: Selected in 2011
The Guarani people have inhabited the region around the falls for thousands of years. According to Guarani legend, the falls were created when a jealous god slashed the river to prevent a young warrior from escaping with his beloved in a canoe. The warrior was turned into the rocks below the falls and the woman into a palm tree above.
Spanish conquistador Alvar Nunez Cabeza de Vaca became the first European to see the falls in 1541. The falls were selected as one of the New7Wonders of Nature in 2011, alongside landmarks like the Amazon River and Ha Long Bay.
Key Facts
- Iguazu Falls consists of 275 individual cascades spread across 2.7 km.
- The Devil's Throat is 82 meters high, 150 meters wide, and 700 meters long.
- The falls straddle two national parks in Argentina and Brazil, both UNESCO World Heritage Sites.
- Average flow is 1,756 m³/s but can surge to nearly 13,000 m³/s during floods.
- The falls are surrounded by one of the last large tracts of Atlantic Forest, home to jaguars and harpy eagles.
Fun Facts
- Eleanor Roosevelt reportedly said "Poor Niagara!" upon first seeing Iguazu Falls.
- On sunny days, permanent rainbows arc across the mist from the Devil's Throat.
- In June 2014, record rainfall caused the flow to spike to over 30 times the normal rate, forcing the parks to close temporarily.
- Thousands of great dusky swifts nest behind the curtain of water and fly through the falls at high speed to reach their nests.
Final Thoughts
Iguazu Falls is a staggering display of natural power and beauty. The combination of 275 cascades, the thundering Devil's Throat, and the surrounding Atlantic Forest rainforest makes it one of the most complete waterfall experiences on the planet.