Old river beds or the Parana's abandoned ones currently make up the basis of this independent and complex net of moist soil, which comprises swamplands, marshy lands, lagoons, sloughs and pluvial-origin streams.
The Ibera system is composed of the great mass of vegetation of the marshy lands. They can hold and retain both water and rainfall, which are roughly 1200 - 1500 millimeters every year, in constant interaction, since the thick layer of boggy vegetation retains and regulates the rainfall in its basin. Out of the huge amount of water, less than one-fourth is derived to the Parana, through the only surface drain in the system, the Corriente river. The rest is done by the vegetal carpet by means of metabolic perspiration and direct vaporization, favored by its great extension and scarce depth.
The sloughs are originated in the water hyacinths, over whose vegetal intertwining is deposited the earth carried by the wind and the water, thus forming the first layer that allows the rooting and growth of various plant species, including trees. Therefore, they constitute true 'floating coasts' - their loosenings becoming 'floating islands' - whose course is directed by the wind and currents.

Within this system, the marshy-land areas cover large extensions. They are deposits of stemmed water, 1 to 3 meters deep, covered with water plants, many times coming from their bottom, with strawy areas along the rims. They can also be floating conglomerates hiding the water surface like sloughs and water hyacinth islands. The latter appear in marshy areas and on the borders of rivers and lagoons. They are made up of floating plants like water lily, lesser duckweed, etc.

Another environment characteristic of this region is the swampland, made up by a temporary accumulation of water, covering the lowest areas in times of heavy rains. Water either drains to temporary brooks, or is absorbed by the ground, remaining only in the permanent lagoons, in the deepest places. When it occupies low, almost flat areas, which make regular drain difficult, they originate a false ground locally known as malezal (undergrowth of weed).

The Reserve is an area with an outstanding abundance in wildlife: home to over 350 species of birds, 85 species of mammals, and more than 70 reptiles and amphibians.

Ñanderetá Inn gives its visitors very comfortable rooms and efficient personalized attention to give them a more comfortable stay. Established in a wood and stone building in the middle of the woods surrounded by pines and a great variety of plants and flowers. Double and triple rooms with private bathrooms, living rooms, game rooms, restaurants, bar, a library, a video library with specialized graphic material, view terrace, cellular phones, dock, boats, our own horses and excursions with special tracks are some of the services offered. The owner, Cielo, born in the city of Mercedes and belongs to a traditional family in Corrientes, along with her husband and children, they all build a familiar environment which makes the staying a lot more cozy.