Park at the back of the large car park, Passage du Four à Pain in Chèzeneuve.
(S/E) Head north on a narrow path between the houses. You will come out onto Chemin des Jardins, which you take to the right. At the next crossroads, take Route de Four on your left. After the rubbish bins, turn right onto Chemin du Bournay and continue straight on for 500 metres.
(1) At the junction with Route de Domarin, first turn left then right to follow Chemin de la Vacheresse, immediately after the 9T sign. Continue straight ahead along the Bois de la Vacheresse. Notice the curious intertwining of different species of trees on the right-hand side of the path (see photo).
(2) When you reach a fork with a signpost, turn left and continue straight ahead until you reach a crossroads. On your right, you will see a magnificent view of the Vercors, the Chartreuse and the Alps on a clear day.
(3) Then turn left. Continue straight ahead, ignoring the paths on the left, until you reach a tarmac road.
(4) Follow it for 80 metres, then take the first path on the left alongside a house. Continue along the path, which becomes a trail. Enter the woods and, just after a humpback bridge, take the path on the left. Keep left again at the crossroads shortly afterwards.
(5) You will arrive at the Ruisseau du Loup ford, which is blocked by a chain to prevent motorcycles from passing. Pass under the chain and cross the ford, then continue along the path, keeping to the right along the stream. When you leave the woods, cross a very small ford (which may be dry depending on the season). At the intersection shortly afterwards, take the path that climbs to the left.
(6) At the crossroads, turn right, then at the next crossroads, take the path on the left, which will lead you to a tarmac road.
(7) Follow it to the right for 50 metres, then take the path on your left that climbs into the woods (not shown on the IGN map), going around the felled trees. You will come out at the top onto a path that you follow to your left. Leave the woods and you will reach an intersection after passing some houses.
(8) Take the first path on the right.
(9) At the intersection 400 metres further on, turn left. You will come to a superb hunters' cabin. You are welcome to have lunch here, provided you leave the place clean. Continue along the path and, at the crossroads, take the path that descends to the left towards the stream. Follow the path that crosses the canalised stream and then goes up to a crossroads.
(10) Then take the path on your right that runs alongside the Tuilière or Galoubier stream. Keep to the left until you come out of the woods. Leave a path on your right and, shortly afterwards, at the next intersection, turn right and continue to Route D'Aillat.
(11) Follow this tarmac road to the left for 80 metres, taking care to avoid traffic and keeping well to the right. Turn onto the first path on your right and continue along it until you reach a crossroads near a tarmac road. Then take the path on your left. Head south-west, ignoring a path on the right and then one on the left.
(12) At the crossroads, turn left onto a path that climbs into the woods. At the next intersection, follow the path on the left uphill. Then, shortly afterwards, follow the path on the right. Continue straight ahead down the hill. When you leave the woods and after a 90° bend in the path, you will come to a path on the right which you should follow. Walking alongside felled trees and logs, take a path on the left which leads you to houses with flags.
(13) When you reach the tarmac road, follow it to your right for 50 metres, then take the path that climbs up to the left. Follow this path, which is not very well marked and has dense vegetation, and which takes you straight across cultivated fields. You will then come to a path that you take on the left. Follow it to the tarmac road.
(14) At the intersection, take the road on the right, then keep left, leaving a road on your right. Then take the path on the left that climbs into the woods. Ignore all the paths on the left until you reach a tarmac road.
(15) Cross it and take the path opposite that goes uphill. At the next intersection, take the path on the right and follow it straight ahead until you reach the tarmac road.
(16) Follow it to the right for 150 metres, then take the path on the left. At the three-way junction, turn left. A little further on, you will see an orientation table on the right (in good weather).
(17) Continue until you reach a road and follow it to the right. As you approach the village, pass the first road on your left, then take the next left, Passage du Four à Pain, after a house with an above-ground swimming pool, and you will return to the car park where you started (S/E).


to complete only the western part of the butterfly wing that forms the entire hike.