Iguazu Falls is located where the Iguazu River tumbles over the edge of the Parana Plateau, 23 kilometres upriver from the Iguazu's confluence with the Parana River. Numerous islands along the 2.7-kilometre long edge divide the falls into about 275 separate waterfalls and cataracts, varying between 200 ft and 269 ft high. About half of the river's flow falls into a long and narrow chasm called the Devil's Throat. The Devil's Throat is U-shaped, 82-meter-high, 150-meter-wide, and 700-meter-long. The border between Argentina and Brazil runs through the Devil's Throat. Of the many islands the most notable is Isla Grande San Martín, on the Argentine side. Individual falls on the Argentine side include Dos Hermanas ("Two Sisters"), Bozzetti, San Martín, Escondido ("Hidden"), and Rivadavia. Notable falls on the Brazil side include Benjamin Constant, Deodoro, and Floriano.
The falls can be reached from the two main towns on either side of the falls: Foz do Iguaçu in the Brazilian and Puerto Iguazú in the Argentine province of Misiones, as well as from Ciudad del Este, Paraguay on the other side of the Parana 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.
Iguazu Falls was short-listed as a candidate to be one of the New 7 Wonders of Nature by the New Seven Wonders of the World Foundation.