Departure from the car park at Saint-Sulpice Church.
(S) From Saint-Sulpice, take the marked path that leads to both passes: Col Saint-Michel and Col du Crucifix. After 1 km, the path arrives at the hamlet of Les Michetons.
(1) Continue along the path uphill. After 500 metres, the path will split in two: a wide path on the right leading to Col du Crucifix, known as the Voie Sarde, and a path opposite, known as the Voie Romaine.
(2) Take the marked path of the Voie Romaine, which climbs diagonally up the side of the mountain.
At an altitude of 830 metres, a sign reminds you that you are on the Roman Way. Continue along this path, ignoring the trails that descend to Vimines. The Col Saint-Michel is now only 400 metres away.
(3) At Col Saint-Michel, read the information boards explaining the importance of this road in ancient times. Another signpost offers the option of visiting the FrançoisI Caves and Lake Aiguebelette.
Leave the Col du Crucifix and head first to the FrançoisI Caves. The trail takes you down to the caves in 15 minutes.
(4) A sign tells us that the king was forced to stay in these caves on his way back from a visit to the Holy Shroud, which was then in Chambéry. Continuing along the path, you will reach an intersection at an altitude of 855 metres.
(5) Make a 600m round trip to the left to the pretty viewpoint over Lake Aiguebelette.
(6) Return to the previous intersection.
(5) On the way back, we climb the Voie Sarde, this time towards the Col du Crucifix.
(7) At Col du Crucifix, take the marked path on the left towards Col de L'Épine, the third pass, which is about an hour's walk away.
(8) From Col de L'Épine, you can take the road that descends to the right to our starting point in Saint-Sulpice, but we're going to look for the paths that lead away from the tarmac. At the pass, facing our direction of arrival, you'll find a path that heads north. After 750m, it will lead to a hairpin bend in the road.
(9) Follow it south for 50 metres to take a path that dips to the left. It will soon lead to the road as well.
(10) Continue straight ahead on a wider path which, after 1 km, will take you back to the road above the hamlet of Les Tonys.
(11) Walk down the road to Les Tonys.
(12) Take a path on the left to descend into the valley, which will also lead to the road.
(13) Continue downhill, but this time the village of Saint-Sulpice is in sight, so all you have to do is descend (S/E).
the route is easy to follow and well marked, except for the return to the small hamlet of "Les Tonys", but there was still about 1.5 km to go to reach the starting point by road.