Esteros of Iberá is one of the richest and longest humidities of our planet.

The " esteros " and lagoons of Iberá and the systems that comprise them represent one of the most outstanding biological areas of Argentina. This huge system of humidity with a great diversity of animals and vegetation, constitute the Natural Patrimony of Corrientes. This is why the government of Corrientes has created " The Natural Reserve of Iberá ", in 15th April of 1983, Act 3771), being the main objective to preserve and keep its natural resources. Its boundaries are: in the North, the National Route nº 12; in the East, the division with The Paraná's tributaries of the Aguapié and Miriñay rivers; in the West, the division with the esteros, streams and tributaries of The Paraná River, especially the Batelito; and in the South, the continuation of the East's division that separates the tributaries' system from the Miriñay's right side as well as in the North of Pay Ubre's river. It stretches, approximately, 13.000 km2, which means the 14,6 % of Corrientes' territory.

The Iberá's system is constituted by a huge mass of the esteros' vegetation with a great capacity of keeping water, and the rainfalls contribute between 1200 and 1500 mm per year. That is, the soft vegetation keeps and regulates the rainwater that falls on its basin. Besides, less than a quarter of the water received, derives from the Paraná's river, through the superficial water pipe of the system, the Corrientes' river. The vegetation is in charged of the rest of the system: its metabolic transpiration and the direct evaporation, which is benefited by the relationship between its huge extension and the lack of depth.