 With an area of [], the commune extends along a north–south axis on both sides of the valley.To the north, Modane is bounded by the Roc des Saints Pères, and the Aiguille de Péclet (northwest) and the Dôme de Polset (northeast).To the south, also from west to east, these are the (marking the boundary with the department of Hautes-Alpes), the Cime de la Planette, the and the Cime du Grand Vallon (marking the boundary with Italy) which delimit the neighbouring communes of Modane and Italy.