An isolated endorreic lagoon with a fluctuating water-level. It is surrounded by Tamarix copses. Part of the lagoon is a gravel-pit.
This is an important site for wintering ducks, particularly Marmaronetta angustirostris and Oxyura leucocephala.
BirdLife International (2021) Important Bird Areas factsheet: Los Tollos lake. Downloaded from http://www.birdlife.org on 18/01/2021.