The region extends from north to south and from east to west, widening above Annecy. Its terrain is a rolling peneplain, broadside at a pad of calcareous mountains to the east (the Semnoz, Mont Bange, Mont Revard) and to the west (Princes Mountains, Gros Foug, Clergeon, Cessens and La Biolle Mountains), which are attached respectively to the prealps and the Jura Mountains.