Ramsar site no. 759. Laguna de los Pozuelos. A permanent lagoon of fluctuating salinity, surrounded by scrubby, semi-arid steppe, extensive marsh and rich grassland. One of the most important sites for waterbirds and Nearctic-breeding shorebirds in the Northern Andean region. Up to 26,000 flamingos use the site and one species nests here.
Local people graze livestock.
Lagunas de Guanacache . A 200km-long system of linked lagoons and marshes fed by the Mendoza and San Juan Rivers in the provinces of those names. The system drains into the Desaguadero River and covers an area of some 10,000 square km. There is a rich biodiversity associated with the system, with more than 50 species of waterbirds. The system has suffered a number of natural and anthropogenic alterations which have considerably reduced the area covered by the lagoons and marshes.