 It has a maximum elevation of 3.5 m above sea level, and comprises a series of lagoons, wetlands and part of the mouth of the Tambo River.A total of 48 species of vascular plants and 17 species of algae have been found in the sanctuary.In freshwater ecosystems trees like pájaro bobo ("Tessaria integrifolia") and sauce ("Salix humboldtiana"); shrubs like callacasa ("Baccharis salicifolia") and chilca ("Baccharis glutinosa"); and some herb species can be found.