Established on March 2, 1988, through Law (D.S.) N 018-88-AG, this is a very important area as it encompasses the only mangrove sweeps in Peru; it is located in the department of Tumbes, province of Zarumilla in an area of 2,972 has. The mangrove area is a refuge for wild fauna, especially in the dry season. It holds crustaceans, birds, fishes and mammals. These mangroves sweeps have a great ecological value, as they are a natural barrier against erosion. A natural secluded area it is not very well known and is a very good place to promote tourism and leisure activities.

There are 5 different types of mangrove sweeps: red mangrove sweep (Rhizophora mangle, Rhizophora harrisonii), the salty mangrove sweep (Avicennia germionans), the white mangrove (Laguncu aria racemasa) and the mangle boton (Conocarpus erectus). In regard to the aquatic fauna we can record 33 types of sea shells 34 types of crustaceans and 105 types of fishes.

The mangrove sweeps of Tumbes is a refuge for the native crocodiles (Crocodylus acutus) which are in danger of extinction.

There are different species of birds, the fragata (Fragata magnificens) being the most remarkable. Of the mammal family we can notice the raccoon (Procyon cancrivorus). The main goal of this sanctuary is to protect the mangroves sweeps wich constitute the only sample of this ecosystem in Peru and are to be turned into a source of turism.