This area was declared reserved on May 29, 1989, through Law (R.M.) 00144-89-AG/DGFF on January 20, 1997, in the department of Lima, province of Lima, district of Chorrillos, covering an area of 396 hectares. This is the only protected area inside the city of Lima, these swamps are connected to the hydrological system of the Rimac River.

There are 67 plants like the grama salada (Distichlis spicata), the reed plant which covers flooded areas together with the scirpus americanus and Paspalum vaginatum. Fauna is represented by 155 species of birds of which 77 are migratories. To be noted: the zambullidor grande (Podiceps major), the zambullidor pico grueso (Podilymbus podiceps), the garza blanca (Egretta thula), the huaco (Mycticorax nycticorax), the pato colorado (Anas cyanoptera), the aguila pescadora (Pandion haliaetus), la polla de agua (Gallinula chloropus), la gallareta (Fulica americana), the playero blanco (Calidris alba), el pata amarilla mayor (Tringa melanoleuca) and the white seagull (Larus modestus). Fishes are found in a dozen different types together with some reptiles and gnawings.

Among the main purposes of this Reserved Area, are the protection of the migratory and resident fauna and the aquatic ecosystem whose preservation is vital to birds in the area and to those that stop before continuing their indefatigable journey.