Semnoz (Cret de Chatillon) from St Jorioz
Semnoz/Cret de Chatillon dominates the skyline of the west shore of Lake Annecy in the Haute Savoie.
The climb leaves the village and climbs steadily through a series of switchbacks for 13km through the villages of Saint Eustache and Chapelle Saint Maurice before arriving at the intermediary Col de Leschaux.
The next 10 km are at a reasonably steady 6% through forests. There is a little respite before the final challenging 3km towards the top of the climb touching 11%.
The Tour de France climbed to a summit finish on Semnoz as recently as 2013, with the Colombian Movistar rider Nairo Quintana riding to victory.
Height at start: 464m
Height at finish: 1660m
Average gradient: 5.2%
Maximum gradient: 10.2%