This protected area is located in Zarumilla Province, Tumbes; close to the border with Ecuador. With an area of, it harbors the largest mangrove forest in Peru.
Ecology
Flora
Five species of mangrove dominate the area: black mangrove, white mangrove, button mangrove and two species of red mangrove. Seasonally dry forest and scrubland can also be found in some parts of the sanctuary; tree species representative of this ecosystem being: Pithecellobium excelsum, Cordia lutea, Mimosa acantholoba, Parkinsonia praecox, Ceiba trischistandra, Loxopterygium huasango, Bursera graveolens, Cochlospermum sp., Prosopis pallida, Capparis scabrida; and some seasonal herbaceous species also found here are: Aristida adscencionis, Bouteloua aristidoides, Stylosanthes sp., Crotalaria sp.,Tephrosia cinerea, Cyperus sp., Scirpus sp., Distichlis spicata, Antephora hermaphrodita, Paspalum racemosum, Ipomoea sp., Bidens pilosa, among others.
It is possible to navigate, by kayak or canoe, the waterways inside the mangrove forest in the zone accessible to tourists. In this area activities like walking on beaches, birdwatching and observation of the use of the mangrove ecosystem by the locals are also allowed. Scientific research has been a constant activity since the creation of the sanctuary.
Environmental issues
The clearance of mangrove forests and nearby seasonally dry forests to open land for shrimp farming and agriculture has an enormous impact on local ecosystems. Shrimp farms also capture and grow larva of local shrimp species from the mangrove forests with help of local inhabitants. These farms and agricultural lands also pollute the area with industrial waste and agricultural runoff. Illegal extraction of edible crustaceans and bivalves; conflicts over land use rights with nearby villages and litter and wastewater discharge from nearby towns into the mangrove forest canals are also environmental issues affecting the sanctuary. Introduced plant species like Tephrosia purpurea, Dactyloctenium aegyptium, Eragrostis cilianensis and Brachiaria mutica are found growing inside this protected area. The American crocodile is no longer present in the area, rendering this species as one of the most threatened in the country.