Park in the Conversaria car park.
(S/E) Leave the car park on the left and follow the sign for Col de l'Arc. Then take a wide track marked Vert Jaune, enter the woods and head for the Machiret fountain on the right of the track.
(1) Continue and begin a steeper climb, finding the Issarts trail at the cattle park. Continue to the right, following the green and yellow markings, and you will reach theGR® Tour des Quatre Montagnes crossroads.
(2) Take it on the right; this is the start of the Sentier Gobert. Now almost level, walk along the balcony path. After a very short climb, you will reach the Combe de Chaulange crossroads.
(3) Continue on theGR® trail, leaving the path through this valley on your right. At the place called Les Côtes, you will come to another trail junction that takes you down to the Croix des Plâtres.
(4) Stay on the GR® trail. Now walk through the woods and follow a remarkable path to reach the Cabane de Roybon.
(5) Begin the descent along the track that follows theGR® trail, leaving it at the junction of two tracks and keeping to the right (signposted Les Plâtres). Pass the Fontaine Magdelen fountain and a few metres further on you will come to another junction of tracks.
(6) Stay on the right-hand track, pass the Les Cochettes sign and continue to the right. When you reach the road, turn right again to return to the Conversaria car park (S/E).
A beautiful loop with lots of people until Combe Chaulange, where hikers descend via the alternative route leading to Conversaria. After that, there is no one else until Roybon's cabin in the forest. The path is very slippery. From the cabin, we saw quite a few people descending and ascending. We arrived at the car park just before the rain forecast for 4pm. Otherwise, it was a beautiful hike.