The Glacier de Bionnassay is the most obvious glacial feature, arising on the north and north-west slopes of the Aiguille de Bionnassay as well as from the western side of the Dôme du Goûter and the Aiguille du Goûter. It descends for approximately 4.5 km, flowing north-westwards before turning north at the foot of the Nid d'Aigle to end some distance above the settlement of Bionnassay, continuing as the Torrent de Bionnassay. This hanging glacier on the north-west face of the Aiguille de Bionnassay provides a route of access for mountaineers with ice-climbing skills.: