Think Positively to be a Positive One: Iguazu Falls_ one of the winners of the New Seven Wonders of Nature by the New Seven Wonders of the World Foundation

Iguazu Falls, in Iguazu River, are one of the world's largest waterfalls. They extend over 2,700 m (nearly 2 miles) in a semi-circular shape. Of the 275 falls that collectively make up Iguassu Falls, "Devil's Throat" is the tallest at 80 m in height. Iguazu Falls are on the border between the Brazilian state of Paraná and the Argentine province of Misiones, and are surrounded by two National Parks (BR/ARG). Both are subtropical rainforests that are host to hundreds of rare and endangered species of flora and fauna.

Iguazu Falls is located where the Iguazu River tumbles over the edge of the Paraná Plateau, 23 kilometres upriver from the Iguazu's confluence with the Paraná River. Numerous islands along the 2.7-kilometre long edge divide the falls into numerous separate waterfalls and cataracts, varying between 60 metres (200 ft) and 82 metres (269 ft) high. The number of these smaller waterfalls fluctuates from 150 to 300, depending on the water level. About half of the river's flow falls into a long and narrow chasm called the Devil's Throat (Garganta del Diablo in Spanish or Garganta do Diabo in Portuguese). The Devil's Throat is U-shaped, 82-meter-high, 150-meter-wide, and 700-meter-long. Placenames have been given also to many other smaller falls, such as San Martin Falls, Bossetti Falls and many others.

About 900 meters of the 2.7-kilometer length does not have water flowing over it. The edge of the basalt cap recedes by 3 mm (0.1 in) per year. The water of the lower Iguazu collects in a canyon that drains in the Paraná River, a short distance downstream from the Itaipu Dam. The junction of the water flows marks the border between Brazil, Argentina, and Paraguay. There are points in the cities of Foz do Iguaçu, Brazil, Puerto Iguazú, Argentina, and Ciudad del Este, Paraguay, which have access to the Iguazu River where the borders of all three countries can be seen, a popular tourist attraction for visitors to the three cities.

Iguazú Falls from the Argentine side

Distribution of the fall between Argentina and Brazil

The Iguazu Falls are arranged in a way that seems a reverse J. The border between Brazil and Argentina runs through the Devil's Throat. On the right bank is the Brazilian territory, which has just over 20% of the jumps of these falls, and the left side jumps are Argentines, which make up almost 80% of the falls.

There are two international airports close to Iguazú Falls: the Argentine Cataratas del Iguazú International Airport (IGR) and the Brazilian Foz do Iguaçu International Airport (IGU). Argentina's airport is 25 kilometers from the city of Iguazu but closer to the Falls hotels than its Brazilian counterpart, there is bus and taxi service from and to the Airport-Falls. Brazil's airport is between Foz do Iguaçu, Brazil and the falls. LAN Airlines and Aerolíneas Argentinas have direct flights from Buenos Aires to Iguazu International Airport Krause and several Brazilian airlines as TAM Airlines, GOL, Azul, WebJet offer service from the main Brazilian cities to Foz do Iguaçu.

Panorama of the Fall

Access

The falls can be reached from the two main towns on either side of the falls: Puerto Iguazú in the Argentina and Foz do Iguaçu in Brazil, as well as from Ciudad del Este, Paraguay on the other side of the Paraná river from Foz do Iguaçu. The falls are shared by the Iguazú National Park (Argentina) and Iguaçu National Park (Brazil). The two parks were designated UNESCO World Heritage Sites in 1984 and 1987, respectively.

The first proposal for a Brazilian national park aimed at providing a pristine environment to "future generations", just as "it had been created by God" and endowed with "all possible preservation, from the beautiful to the sublime, from the picturesque to the awesome" and "an unmatched flora" located in the "magnificent Iguaçú waterfalls". These were the words used by Andre Rebouças, an engineer, in his book "Provinces of Paraná, Railways to Mato Grosso and Bolivia", which started up the campaign aimed at preserving the Iguaçu Falls in 1876, when Yellowstone National Park, the first national park on the planet, was four years old.

The Argentinian side has wider views of the falls. On the Brazilian side there is a walkway along the canyon with an extension to the lower base of the Devil's Throat and helicopter rides offering aerial views of the falls are available. Argentina has prohibited such helicopter tours because of the environmental impact on the flora and fauna of the falls. From Foz do Iguaçu airport the park can be reached by taxi or bus to entrance of the park. There is an entrance fee to the park on both sides. Free frequent buses are provided to various points within the park. The town of Foz do Iguaçu is about 20 kilometres away and the airport is in between the park and the town.

The Argentine access across the forest is by a Rainforest Ecological Train very similar to the one in Disney's Animal Kingdom. The train brings visitors to the entrance of Devil's Throat as well as the upper and lower trails. The Paseo Garganta del Diablo is a one-kilometer-long trail that brings the visitor directly over the falls of the Devil's Throat, the highest and deepest of the falls. Other walkways allow access to the elongated stretch of falls across the forest on the Argentine side and to the boats that connect to San Martin Island. Also on the Argentinian side there is inflatable boats service that takes visitors right under the falls.

The Brazilian transportation system aims at allowing the increase in the number of visitors while reducing the environmental impact through the increase in the average number of passengers per vehicle inside the Park. The new transportation system boasts new 72 passenger panoramic view double deck buses. The upper deck is open, which enables visitors a broad view of the flora and fauna during the trip to the falls. The buses' combustion systems are in compliance with the CONAMA (phase IV) and EURO (phase II) emissions and noise requirements. The reduction in the number of vehicles, of noise levels and of speed is enabling tourists to observe increasing numbers of wild animals along the route. Each bus has an exclusive paint scheme, representing some of the most common wild animals found in the Iguaçú National Park, including the spotted jaguars, butterflies, raccoons, prego monkeys, coral snakes, toucans, parrots and yellow breasted caimans.


Walkways allow close views of the falls from both Argentina and Brazil.

Comparisons to Other Famous Falls

Upon seeing Iguazu, the United States' First Lady Eleanor Roosevelt reportedly exclaimed "Poor Niagara!" Iguazu is also often compared with Southern Africa's Victoria Falls which separates Zambia and Zimbabwe. Iguazu is wider, but because it is split into about 275 discrete falls and large islands, Victoria is the largest curtain of water in the world, at over 1,600 m (5,249 ft) wide and over 100 m (328 ft) in height (in low flow Victoria is split into five by islands; in high flow it can be uninterrupted). The only wider falls are extremely large rapid-like falls such as the Boyoma Falls.

With the flooding of the Guaíra Falls in 1982, Iguazu currently has the second greatest average annual flow of any waterfall in the world, after Niagara, with an average rate of 1,746 m³/s (61,660 cu ft). Its maximum recorded flow was 12,800 m³/s (452,000 cu ft/s). By comparison, the average flow of Niagara Falls is 2,400 m³/s (85,000 cu ft), with a maximum recorded flow of 8,300 m³/s (293,000 cu ft/s). The average flow at Victoria Falls is 1,088 m³/s (38,420 cu ft/s), with a maximum recorded flow of 7,100 m³/s (250,000 cu ft/s).

Mist rises between 30 metres (98 ft) and 150 m (492 ft) from Iguazu's Devil's Throat, and over 300 m (984 ft) above Victoria. However, Iguazu affords better views and walkways and its shape allows for spectacular vistas. At one point a person can stand and be surrounded by 260 degrees of waterfalls. The Devil's Throat in Argentina has water pouring into it from three sides. Likewise, because Iguazu is split into many relatively small falls, one can view a portion at a time. Victoria does not allow this, as it is essentially one waterfall that falls into a canyon and is too immense to appreciate at once (except from the air).

On November 11 of 2011, Iguazu Falls was announced as one of the seven winners of the New Seven Wonders of Nature by the New Seven Wonders of the World Foundation.