The Ibera Wetlands are the second-largest wetland in the world after Pantanal in Brazil. It is of pluvial origin, with a total area of 15,000–20,000 km2 (5,800–7,700 sq mi).

The Iberá Wetlands (Spanish: 'Esteros del Iberá', from Guaraní ý berá: "bright water") are a mix of swamps, bogs, stagnant lakes, lagoons, natural slough, and courses of water in the center and center-north of the province of Corrientes, Argentina. The name means 'bright water' in the Guaraní language, and is home to more than 400 species of plants and animals.

The basin itself, formed through tectonic plate movements, is filled not by a river or underwater flow, but by natural rainwater that collects in the area. The reason, however, for its huge importance, is that it is a filter for one of the largest underground lakes in the world and, quite probably, one of the most important reservoirs of water for the future of the planet, the Guarini Aquifer.

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