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Park in the Fort Inférieur car park, which is immediately on the left after the tunnel.
(S/E) Cross the D1206 road above the car park with caution and climb the signposted path leading to Fort Supérieur (about 30 minutes).
Before continuing on the route that branches off to the left, take a detour to the upper fort. From there, you can enjoy two superb views, one of the Vuache mountain and the lock gorge, and the other of the Rhône valley.
Retrace your steps and then continue along the yellow-marked route (sign), a wide path that descends to the Longeray car park.
(1) In the village, turn right onto the marsh path, which climbs more gently than at the start of the hike. The path is well marked in yellow and a little further on, red signs make the trail even more visible. Cross a few pastures and keep dogs on a leash as there are herds of cows.
(2) The path leads to a small road which you cross towards Grésin. At the next crossroads, continue straight ahead. The route continues to the left towards Léaz, offering beautiful views.
(3) Cross the D1206 with caution and arrive at Léaz. Go down Rue du Calvaire, Rue Saint-Amand, then Chemin des Moulins.
(4) Go up to the right to the Léaz viewpoint (10 mins) for the view, then retrace your steps. Head towards Fort Inférieur
(5) Turn right quickly and start descending to the banks of the Rhône.
(6) Take the footbridge, follow the Rhône and arrive at the ruins of the Condière mills.
(7) At the end of the path, turn right, cross the railway line and continue right along Chemin du Lavoux until you reach the hamlet of the same name.
(8) Cross the Lavoux to reach the car park, the starting point of the hike (S/E).
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Very difficult 
Difficult 
