The balance of our ecosystem, keeper of the water's quality

This larst board reminds one of the great principals of the water cycle.
It therefore shows how the rainfalls infiltrate the hillock, go through the geological layers, and constitute in the multiple cracks of the underground the water pumped from differents parts of the hillock. Sassay's water's cycle ends there, where the spring appears and by where the path started.
The soil which is partly from the alteration/transformation of the rocks into water, will favourise the installation of the vegetation which in turn bring on various milieux, mediums of a remarkable biodiversity and mirror to an ecosystemical balance. The fact that these parametres are found on Brandefer Hillock indicates that it is a remarkable island of ordinary biodiversity.