From the Maison du Lac, climb towards Nances, where you'll head due north to the foot of the fearsome Relais du Mont du Chat.

Don't panic: your route will take you in the more "rolling" direction of Lac de Chevelu. In splendid surroundings, you'll reach Yenne before tackling the most difficult part of the route: Mont Tournier. 10.5 km at 5.5% average gradient. A little-frequented pass with a wooded summit at 820 m altitude.
You then descend from Sainte Marie d'Alvey to the foot of the Col de la Crusille (2 km at 6%).
The final descent takes you back to the shores of Lac d'Aiguebelette.
Good plans : The variant avoiding the Mont Tournier pass via Gerbaix offers a 58 km loop with 1,200 metres of d/+.

Admission fee : Free access.

Opening : All year round daily.