It is now also involved in restoration projects within the catchment area, in order to preserve biodiversity. The water, collected from the Mont Blanc Massif, is channelled into the reservoir, located at an altitude of 1,930 m a.s.l. The water comes from the high valleys of the river Arve and Eau Noire (France), and from the Ferret andTrient valleys (Switzerland). Through collectors located on the French side, the water is routed to the reservoir by gravity.