Ÿou will find yourself on the last “rock bar” cleared by the Gébroulaz glacier. Towards 1730, the “Sarde map” (land registry of the kingdom of Piedmont-Sardinia) identifies the glacial threshold at the foot of this “rock bar”. This glacier is followed between 1907 and 1965 by the Eaux et Forêts (Forestry and Water), and from 1991 by the CNRS (French National Centre for Scientific Research). It is part of a network of 9 worldwide glaciers (5 Alpine, 2 Andean and 2 Antarctic) used for the long-term monitoring of glacial and meteorological data.