The Massif du Sancy is a volcanic mountain mass located in the Massif Central, in the middle of Auvergne, more precisely in the Puy de Dôme department, by thirty kilometres at the South of Clermont-Ferrand. Water there is everywhere, whatever the mountainside is: you cannot miss it.
Waterfalls, springs and watercourses, even peat bogs: water is omnipresent. Thus the following question: why does the Massif du Sancy enjoy such a hydrography?