Throughout the area several permanent lagoons of different size can be distinguished; the largest of them are the eponymous Iberá and Luna, on which banks the village of Colonia Carlos Pellegrini was founded.
The lagoons Fernández, Galarza, Medina, Paraná and Trin also exceed 15 km² (5.8 sq mi).
This lagoon system is typically very shallow, although in times of floods it can reach over three meters deep.
Few areas of dry land alternate with these water bodies, mostly low and sandy hills; the rest is covered by a large expanse of floodplains.

Spatial orientation becomes extremely difficult because the exact profile of the solid surface is constantly changing, and the visual continuity between the dry land and swamps is almost seamless due to the large number of semi-submerged vegetation.
In addition, natural dams are formed by root entanglement of floating vegetation formations that are sometimes strong enough to walk on them.

The climate is distinctly subtropical.
Winters are relatively dry, with minimum temperatures reaching −5 °C (23 °F), and strong precipitations during autumn and spring.
Summer is very hot and humid, with highs easily exceeding 45 °C (113 °F).
Annual rainfall averages 1,700 mm (67 in).
Throughout the area several permanent lagoons of different size can be distinguished; the largest of them are the eponymous Iberá and Luna, on which banks the village of Colonia Carlos Pellegrini was founded. The lagoons Fernández, Galarza, Medina, Paraná and Trin also exceed 15 km² (5.8 sq mi). This lagoon system is typically very shallow, although in times of floods it can reach over three meters deep. Few areas of dry land alternate with these water bodies, mostly low and sandy hills; the rest is covered by a large expanse of floodplains.
Spatial orientation becomes extremely difficult because the exact profile of the solid surface is constantly changing, and the visual continuity between the dry land and swamps is almost seamless due to the large number of semi-submerged vegetation. In addition, natural dams are formed by root entanglement of floating vegetation formations that are sometimes strong enough to walk on them. 
The climate is distinctly subtropical. Winters are relatively dry, with minimum temperatures reaching −5 °C (23 °F), and strong precipitations during autumn and spring. Summer is very hot and humid, with highs easily exceeding 45 °C (113 °F). Annual rainfall averages 1,700 mm (67 in).
Iberá Provincial Reserve