Geography They are separated from the Cottian Alps in the east by the Col du Galibier and the upper Durance valley; from the western Graian Alps (Vanoise Massif) in the north-east by the river Arc; from the lower ranges Vercors Plateau and Chartreuse Mountains in the west by the rivers Drac and Isère. Many peaks rise to more than , with Barre des Écrins (4,102 m) the highest.
gEOgrapHy They are SepArated from the cottIAn alpS iN the East by ThE Col du gaLibIEr ANd tHe UpPeR duRance vAlleY; frOM ThE Western gRaian alpS (VanoIse mAsSif) iN The north-east bY tHe RIver aRC; from the LoWeR ranGes verCoRS pLAteau aNd chaRTreUse mOuNtaiNs In ThE WeSt by ThE Rivers dRac and isère. MAny pEaks rISe To More than , WItH BARre Des écrIns (4,102 M) the HIgHest.