Corrientes province is part of the Mesopotamia argentina and more broadly in the region known as the coastline. Province is a flat, with the exception of the area known as Tres Cerros (near the town of La Cruz), east of the province, where there are some minor elevations of the hill that stands out the Nazarene, the highest point of the province with 179 meters above sea level. To the west is a series of steps whose heights decrease to reach the river Paraná, south, confining with Entre Rios there is a low plateau: the Payubré covered by dense jungle until the end of s. XX. The area of the Ibera marshes and ponds, covering one quarter of the provincial area, is a large depression in stroke volcanic soil, then covered by sediments of fluvial and eolian origin. The exact area occupied by wetlands varies with the height of the rivers in the region, which is connected with the underground, while the southern edge of the area is clearly defined by the natural boundary of the geology of an area of Entre-low hills that occupies the southern half of the province, northwest and northeast borders have no solution of continuity with the rest of the landscape. The geological origin of the zone is not clear. The most convincing hypothesis suggests that the Ibera basin would consist of the old bed of the Paraná River, which was diverted after the erosion made practicable the flow through the rocky bank of the falls Yacyreta-APIPA. Supports this theory the origin aluvionario soil, composed of layers of sand and silt on a bed of impermeable clay that prevents direct drainage of water. The circulation of these are produced through the Rivers Flow and Miriñay into the basins of the Paraná and Uruguay respectively. The frequent rains, especially during spring and autumn, the reset level of the marshes, which has shown tendencies to change in recent years.
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