By car in Saint-Vallier, take the old Route Napoléon towards Chapelle Sainte-Luce, which you should then leave on your right and continue along the Chemin de la Siagne to the cistern car park.
(S/E) Take the path on the left that descends to join theGR® 510 at marker 80. Follow it to the right towards the Chapelle Saint-Jean. Cross the Vallon de Bramafan stream, pass marker 82 and then head to the Chapelle Saint-Jean.
Stop here to visit the chapel and its old mill on the banks of the Siagne.
(1) Then continue along the path, cross the old bridge and head due north up the stony path, which is quite steep; pass the Vieux Pont and then the houses of Léchen. Leave the wide path on your right and continue left on the GR®. Reach marker 84, a crossroads of paths.
(2) Keep to the right on theGR®, continue on, pass marker 91, and further on reach the Chapelle Saint-Martin, a Romanesque chapel now in ruins.
(3) Stay on theGR® heading due west; this is the historic old path taken by Napoleon and his troops. Follow the right bank of the Vallon de Saint-Martin stream at a distance. Reach the first houses of La Colette, running parallel to the N 85 (New Napoleon Road), and reach the end of the climb here.
(4) Leave theGR® here and turn left heading due south, following the forest track along the ridge. You will reach the junction marked with signpost 85.
(5) Take the track on the left, head downhill and reach the junction marked 86.
(6) Leave the track here and turn left onto the path leading to the ruins of Rouyère mentioned at marker 87.
(7) Continue left along the path after the ruins to descend towards theGR®510. Follow this path, ignoring the turnings to the right or left, to return to the junction marked by signpost 84, which you passed on the way out.
(2) Turn right and follow the route taken on the way there in the opposite direction.
(1) At the Chapelle Saint-Jean, you can follow the road to reach the cistern car park more easily (S/E) without having to tackle the final steep climb.