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.

The Brazo del Este is located 20 km south of Seville in the Guadalquivir river estuary, which is an area with one of the highest levels of biodiversity in the Iberian peninsula. This former branch (brazo) of the Guadalquivir is east (este) of the river and is now a reed-fringed lagoon and wetland area surrounded by rice plains and farmland.