The park around the lagoon was created in 1940 to protect the lagoon and particularly the population of black-necked swans (Cygnus melancoryphus). It has an area of 112.5 km². The lagoon is situated in the Patagonian steppe, surrounded by hills and gorges.
It has important aquaticbird fauna, of several species and in great number. Near the lagoon is the Salamanca cave, historically inhabited by humans, where rock paintings, typical of northern Patagonia, can be seen. Other mapuche and prehistoric human artifacts have been found in the park.