At the south-east extremity of the plateau, the highest part of the enclosing ridge is surmounted by two conical summits, of which the higher south-west point (Grand Combin de Grafeneire) is 4,314 meters in height, while the neighbouring north-east summit (Aiguille du Croissant) is lower by less than 60 meters (4,260 metres). Two other minor summits over 4,000 metres are located on the ridge: the Grand Combin de Valsorey (4184 m) on the west and the Combin de la Tsessette (4135 m) on the east. On the west side, the plateau sinks to a considerably lower level, and over this lies the Col des Maisons Blanches (3,418 m), by which access to the Corbassiere valley is obtained from the side of the Val d'Entremont.