The Grand Argentier is the main summit of a ridge dividing the valley of the Ruisseau du Frejus (NE) from the valley of the Torrent de Fontane Froide, both tributaries of the Ruisseau du Charmaix, which ends in the Arc downstream of Modane. Towards SE the mountain is connected with the neighbouring Punta Nera by a saddle at 2,996 m of elevation., while the water divide Fréjus/Fontaine Froide continues with the Col du Petit Argentier (2,599 m) and the Petit Argentier. The southern slopes of the Grand Argentier are mainly detrital, while its western face, flanking Fontaine Froide valley, is remarkable for a large dolomite escarpment.. Its summit is marked by a cairn.