This is a region of large rivers, humid tropics, red earth, magnificent forests, and extraordinary flora and fauna. Great Waters – “Iguazú” in the Guaraní language – overflowing into one of the world’s wonders: the Iguazú Falls, located on the limit between Argentina and Brazil. The Iguazú river throws water along 275 falls spread in half-moon over 2,7 km. About half of the river's flow falls into a long and narrow abyss called the Devil's Throat (Garganta del Diablo in Spanish) The Iguazú National park is a subtropical jungle. The fauna of the park includes jaguar, South American Tapir, Ocelot, tirica, anteater, the Harpy Eagle, and the Yacare Caiman. Large toucans, mammals like the coatí, and a diversity of butterflies can also be found.

The Iberá Wetlands (in Spanish, Esteros del Iberá) are a mix of swamps, lakes, lagoons, and courses of water in the province of Corrientes. The Esteros are the second-largest wetlands in the world, after Pantanal in Brazil. The biodiversity includes: red deer of marshes, yacaré caiman, river otter, and a wide variety of birds.