Sistema Lagunar Agiabampo  Bacrehuis  Río Fuerte Antiguo. 02/02/08; Sonora; 90,804 ha; 26° 12´ N and 109° 14´ W. This estuarine system is located in the coastal area south of the state of Sonora and to the north of the state of Sinaloa, with direct communication with the Gulf of California. It consists of five bodies of water, almost all linked to each other, sharing a single opening to the Gulf of California, as well as sharing two bays and many estuaries. In the bodies of water there is no important freshwater supply, except for the Agiabampo  Bacorehuis lagoon, which is important because it is surrounded, as well as the estuaries, by Red mangrove (Rhizophora mangle), Black mangrove (Aviciennia germinans), White mangrove (Laguncularia racemosa) and Buttonwood mangrove (Conocarpus erectus). Agriculture, fisheries, aquaculture and tourism are economic activities that are practiced in the area and have negative impacts on the site, posing a threat to the biodiversity of the area. The site is located in the migratory pathway of various species of birds, providing them food and protection; it is also an area of refuge, feeding and growth for aquatic species such as crustaceans, fish, mollusks and marine mammals. The resident and migratory birds are represented by seventy species of which nine are endangered. The site is proposed as a priority area for conservation by Ducks Unlimited and is considered an Important Bird Area (IBA).