the Col des Hirondelles, the summit ridge connects Pt. Walker to the other summit points and then descends to the Col des Grandes Jorasses where a bivouac shelter is located - the Bivouac E Canzio hut. The ridge forms the French-Italian border, almost all of which is above 4,000 m (13,000 ft). See also List of 4000 metre peaks of the Alps Planpincieux Glacier References External links Grandes Jorasses on French IGN mapping portal Alpine four-thousanders France–Italy border Great north faces of the Alps International mountains of Europe Mountains of the Alps Mountains of Haute-Savoie Mountains of Italy Mont Blanc massif