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There is a small shaded parking area on the right, 500 m after Pont-les-Moulins, on the D21, 200 m before the bridge over the Cusancin. The yellow and blue signposts are easy to follow.
(S/E) Head towards the bridge and immediately turn right onto a gravel road (towards "Mont de Guillon") to start the hike. At the first fork, ignore the road going uphill and continue straight ahead.
(1) You will pass the Narines du Diable, a cavity in the rock, then follow a long meadow bordering the Cusancin. Between the trees on the left, you will catch a glimpse of the river and its waterfalls. Continue straight ahead, ignoring the paths that descend to the right. You will pass "l'Orangerie", the former thermal baths of Guillon-les-Bains.
(2) At the first houses in Guillon, you will come to a small paved road, which you follow to the right. It quickly becomes stony as it enters the forest. After passing under a high-voltage power line, continue climbing to the right. At the clearing where I spotted a deer leaping, continue along the same stony path. It gradually becomes less stony. Ignore two grassy paths that branch off to the right.
(3) About a hundred metres after a hairpin bend, there is a fork at the foot of a signpost. Continue uphill to the left, towards "Mont de Guyon". At the next fork, keep left until you see a farm. Just before the buildings, take the dirt track on the left again, which heads back into the woods and runs along the edge of the cliff.
(4) You will arrive at the Mont de Guillon viewpoint overlooking the Cusancin valley. To your right is Baume-les-Dames, overlooked by the Roche de Châtard and the Fente de Babre, and to your right, the Lomont wind turbines. Leave the viewpoint on the right (facing the valley) and head towards the small tarmac road that you can see. Turn left, passing the second farm 400 metres ahead.
(5) Follow the pretty forest path on the left that descends into the valley. A little further down, you will come back to the road, which you follow for another 400 metres to rejoin the D306. Cross the road and continue downhill on the path opposite. When you hear the murmur of the river, at the hairpin bend, turn right.
(6) At the departmental road, turn right. Cross the small bridge and immediately turn left, following the river for about 100 metres and climbing up to the right along the path that goes up the wooded hillside.
(7) Halfway up, you will come to a pasture with a view of the village and the cliffs of Mont de Guillon. Cross the pasture and follow the signs to the foot of a beautiful, well-marked path that climbs into the forest.
(8) You will reach a hiking trail that branches off to the right towards Cusance. Continue straight ahead towards Pont-les-Moulin. Fifty metres further on, at another fork, keep left, walking alongside a beautiful old pile of stones gathered from fields.
(9) You will soon come to another hiking trail. Continue straight ahead, following the dry stone wall. When you reach a wider farm track, continue downhill to the left.
(10) At the departmental road, turn right towards the bridge to return to the car park (S/E).
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