The definition of water here is given by the equilibrium between the sea and river waters, therefore water is salted, and water is fresh, somewhere in between certainly. Vegetation is a good witness, just here there are immense numbers of plants that only could grow here. Some of them show that life here is extreme, letting their roots out in the air to be seen, seeking for the oxygen that the saturated ground appears not to provide.
This forest is located at the interface between sea and fluvial waters, and therefore, the water levels are directly determined by the tidal variations. The sea level acts as a downstream boundary condition that propagates upstream through the main and branch channels that cross the Sundarbans. The tidal variations have an influence on the way people live here in reation to the water by dealing with inundated areas, on navigation, and even on the movements of fauna. Anyone willing to cruise the waters is aware of the dynamics of this system, local people are aware of this from childhood, learning how and when to sail.
The vital equilibrium between fresh and salted water has been altered by man: the construction of dams and prown farms are interrupting this exange, causing the phenomenon of the "desert of water". In fact in some zones, because of the decrease in fresh water immission, the salinity of the water had reach a rate so high that vegetal and animal life is not able to adapt to the rapid change and is disappearing.
Among local people, a mystical way of thinking says that we are here to move not from the Creator to the sea, the end, but the other way, from here to the heights, to the Source. This is the doctrine of the reverse way (Based on "La Fabula de Shelabuna" by P. Marino Rigon, s.x.)