Departure from the hamlet of Le Badier, which can be reached via a small road leading off the D385 (Azergues valley road) just after Letra. Parking is available on the side of the road just before the hamlet or on a platform after the hamlet at the junction of the path you need to take when leaving the road.
(S/E) Continue along the road, cross the hamlet and keep to the right at the cross.
(1) Leave the road and take a path on the right. Further on, ignore the path that branches off at a 90° angle to the right and seems to descend into fields, and stay on the main path. Continue straight ahead along the Ruisseau du Badier for about 4 km, alternating between the left bank, right bank and left bank, sometimes right next to the stream and sometimes a hundred metres away.
(2) Do not take the path that climbs to the left, but stay on the path that branches off to the right and continues along the stream. After a climb, you will reach some abandoned barns at a place called Les Razes. The first crossing of the stream is via a stone bridge, the second via a wooden footbridge, and the next requires you to wade across the stream.
(3) Take the road that looks more like a path on the left and follow it to Croix Papin.
(4) Turn left onto the D157 towards Chamelet: this is a very small road.
(5) At a hairpin bend to the right, take the path on the left and you will come to a fork.
(6) Turn right to climb Mont Montoux, following a small path through the bushes. Reach the summit, or rather the summits, then follow the path that descends sharply along the ridge line.
(7) At the first slight plateau a few metres long, there is an alternative route. It is described in the "Practical Information" section and on the GPX track on the map. Otherwise, continue along the small path that leads to a meadow, climb over the fence and descend the meadow keeping the fence on your left, reach the path that emerges in the meadow and follow it to the left. This path leads to another meadow, cross it to join the GRP® by passing under the fence to the south-east of this meadow. Then continue to the right to rejoin the route described.
(8) Turn left towards La Burie. The path is very wide and descends gently, offering a beautiful view of the Azergues valley, the Monts du Lyonnais and perhaps the Alps. Ignore a path that branches off to the left opposite a vineyard on a right-hand bend; the hamlet of Le Badier is not visible.
(9) Just before La Burie, in a slight right-hand bend, the hamlet of Le Badier is clearly visible below. Take the path on the left towards La Croix Blanche du Badier. Once at the cross, turn right, cross the hamlet again and return to the car park (S/E).
Caution