The longest and largest glacier in France is smaller than what glacier in the Alps?
Mer de Glace The Mer de Glace is a valley glacier located on the northern slopes of the Mont Blanc massif, in the French Alps. It is 7.5 km long and 200 m deep but, when all its tributary glaciers are taken into account, it can be regarded as the longest and largest glacier in France, and the second longest in the Alps after the Aletsch Glacier.
Argentière Hut The Argentière Hut (French: "Refuge d'Argentière") is a refuge in the Mont Blanc massif in the Alps. Built in 1974 by the CAF, it is located above the north bank of the Argentière Glacier in France at an altitude of 2,691 meters above sea level.