 The Glacier Noir is fed from two high-altitude firn basins.The northern branch ("branche septentrionale") is in turn fed from the bowl below the "Col des Avalanches", at the foot of Pic Coolidge and the Barre des Écrins, the southwesternmost four-thousander of the Alps.From here it flows below the south face of the "Crête de l'Encoula" (also