The boundaries of Pedro Muñoz are within the drainage basin of the Záncara River, a tributary of the Guadiana, and host the wetland complex of Pedro Muñoz, made up of three principal lakes: Vega Lake, Retemar Lake and Navalafuente Lake.
This wetland complex was declared a nature reserve in 2002, after receiving the following statements of protection: the wildlife refuge of Vega Lake in 1988, a special protection area for birds (ESPA) in 1989 and a wetland of international importance as a habitat for waterfowl (Ramsar Convention) in 1993.
The biosphere reserve of the Wetlands Area was declared by UNESCO in 1981 and comprises a set of lakes and marshes in La Mancha.

Vega Lake is the most important of the complex.
It is a sweetwater lake which encourages the growth of non-halophytic vegetation.
It has a surface area of 54 hectares and in summer is supplied with water from the treatment plant which alters its natural hydro-chemical composition from flooding and drought.
The fauna is abundant with more than 23 species of waterfowl, most notably ducks and waders.
Others can be found in the list of the Ramsar Convention.

Navalafuente is an ephemeral or intermittent lake that is formed in very rainy years.
Retemar is a purely endorheic lake.
The boundaries of Pedro Muñoz are within the drainage basin of the Záncara River, a tributary of the Guadiana, and host the wetland complex of Pedro Muñoz, made up of three principal lakes: Vega Lake, Retemar Lake and Navalafuente Lake. This wetland complex was declared a nature reserve in 2002, after receiving the following statements of protection: the wildlife refuge of Vega Lake in 1988, a special protection area for birds (ESPA) in 1989 and a wetland of international importance as a habitat for waterfowl (Ramsar Convention) in 1993. The biosphere reserve of the Wetlands Area was declared by UNESCO in 1981 and comprises a set of lakes and marshes in La Mancha.
Vega Lake is the most important of the complex. It is a sweetwater lake which encourages the growth of non-halophytic vegetation. It has a surface area of 54 hectares and in summer is supplied with water from the treatment plant which alters its natural hydro-chemical composition from flooding and drought. The fauna is abundant with more than 23 species of waterfowl, most notably ducks and waders. Others can be found in the list of the Ramsar Convention.
Navalafuente is an ephemeral or intermittent lake that is formed in very rainy years. Retemar is a purely endorheic lake.
Pedro Muñoz