Utrera Natural Reserve contains three saltwater lakes. Laguna de Zarracatín is around ten times the size of the other two, Laguna Arjona and Laguna Alcaparrosa. The lakes and their protected environs cover 1,161ha. Like the Lebrija-Las Cabezas Natural Reserve, it provides an alternative habitat for birds in the nearby Guadalquivir delta. Birds from the Embalse Torre del Aguila, which is about 3km east, also use the reserve.