Can Gio mangrove forest develops by the accumulation and aggradation of silt from Sai Gon – Dong Nai river to the lower section – Long Tau and Nga Bay river, Dong Tranh, Nha Be and Soai Rap river.

Can Gio mangrove forest’s environmental conditions are very special: an intermediary ecosystem (buffer system) between aquatic and on land ecosystems, fresh water and salt-water ecosystems. It is a by-the-sea area with many estuaries. Can Gio mangrove forest receives a great deal of silt and nutrients from the upper section and basins of rivers. Under the influence of the sea – the tide, Sac forest’s botanic system has been formed with an abundance of types and this is the supply of food and the sanctuary for aquatic organisms and on land vertebrates

Vam Sat salt-marsh alone has an abundant and assorted system of animals and plants: Rhizophora apiculata (Duoc tree), Nipa fruticans, Melaleuca cajeputy (Tram tree), Sonneretia alba, Sonneretia ovata, Sonneretia casseolaris (Ban tree), Aegiceras corniculatum (Su tree), Bruguiera cylindrica (Vet tree); 63 species of microorganisms, 140 species living at the bottom as shrimps, crabs, shell-fishes, 45 types of fishes, 8 types of reptiles, 37 species of birds and other species such as monkeys, deers, weasel. There are also some valuable and rare species listed in Red Book: Crocodile porosus, Spot-billed Pelican, Smooth Otter.