French, glacier, "sea of ice" (3.5 mi/5.6 km long; 16 sq mi/41 sq km).

Located in the Haute-Savoie department, Eastern France, on the northern slope of Mont Blanc massif.

It is formed by the junction of three smaller glaciers and extends a few miles North East of Chamonix. There are deep crevasses and high seracs, "ice needles". The glacier is the second-longest glacier in the Alps, after the Aletsch Glacier (the largest glacier in the Alps, covers more than 120 square kilometers [more than 45 square miles] in southern Switzerland).