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Warning: as there are no hiking trails, this walk mainly follows small, quiet roads and paths.
From Varennes-sous-Dun, head towards Lyon via the Col des Echarmeaux. About 1 km after leaving the village, turn right at the bend, cross the small bridge and park in the spinning mill car park. This car park is private but parking for a few vehicles is permitted. You can visit the museum and sheep park on your way back from your hike.
(S/E) Cross the spinning mill premises, then turn left when you reach the road (Côte 433) and follow it to the next intersection (calvary). Take the road on the right towards "Les Gachers" and continue until you reach "Trémont".
(1) Stay on this road to reach the hamlet of "La Faux". When you reach the hamlet of La Faux, turn right towards the south, pass the calvary (erected by P. Verchère in 1879), then take the path on the left (signposted "Liaison route Saint Racho") and follow it to the hamlet of Les Corneloups.
(2) Turn right twice and follow the road that climbs through the woods towards Montagne de Dun. At the top of the climb, take the small path that leads to the chapel to enjoy the magnificent panorama of the region (two orientation tables).
(3) After walking around the chapel and admiring the view of the Mussy Viaduct, descend via the path on the right to Dun, then continue along the road southwards to the next crossroads (elevation 597). Turn left and follow the road towards Mussy. At the next crossroads (elevation 543), take the road on the right towards "L'Aye", where you can enjoy a magnificent view of Mussy and its viaduct.
(4) In the hamlet, turn left onto the small ridge path that descends towards Mussy. At the next fork, take the left-hand path and descend towards the small wood and its statue of the Virgin Mary. Then take either of the two paths that descend towards the village.
(5) When you reach the top of the village, turn right onto the road that climbs northwards towards the hamlet of Les Trouillets (beautiful view of the west side of the viaduct). Pass the hamlet, then turn left at the next intersection, then right twice towards Dreuillien (beautiful view of the Loire Valley to the west).
(6) At Dreuillien (elevation 571), continue north through the woods for about 1,200 metres. Ignore the logging tracks, then when you reach a crossroads with several well-marked paths, take the path furthest to the right heading east (this is not shown on the topographical map), which leads through the woods to the road connecting Beauvernay and Les Avaises.
(7) When you reach the road, turn left, then after the first houses, take the road on the right, then at the next crossroads, turn left onto the road that goes north. Pass La Segaude farm, then about 400m after, take the small path on the right that goes east towards Vaux.
(8) In Vaux (elevation 401), take the road on the left towards Montgesson. Before reaching the large Montgesson farm, take the grassy path that heads north and joins the path coming from the farm 200 metres further on. Continue along the path towards "Les Brûlés" and your starting point (S/E).
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Tourist office
Very difficult 
