The starting point is the Pont de l'Isle car park on the RD436 road (towards Geneva), 2 km from Saint-Claude town centre.
(S/E) With your back to the car park, turn right and cross the bridge over the RD436 road (take care), then take the path on the right towards the Queue d'Âne and Queue de Cheval waterfalls.
The path follows the river (on its right bank) through a pleasant wooded area. At the Grosdar footbridge, continue straight ahead towards the Queue de l'Âne waterfall.
A little further on, take the bridge at the Fontaine aux Oiseaux while continuing to follow the yellow markings on the left. You will come to a crossroads (the path on the right is marked with a yellow cross).
(1) Continue straight ahead and after a series of small ascents and descents, you will arrive at the Queue d'Âne waterfall: you can get closer to it by taking a small unmarked path.
(2) Turn back along the same path. After a series of steps leading uphill, you will arrive at a fork just before you.
(1) Take the path on the left (marked with a yellow cross) to reach a forest track higher up at a hairpin bend. Turn left, then quickly take a path on the left uphill. After a few hairpin bends, you will reach a fork: turn right and shortly afterwards you will reach a forest track near the Grange des Orgières.
(3) Turn left (follow the yellow markings). The path then climbs steadily through the woods until you reach another building after a few minutes.
(4) At Montoux: turn left towards the Cascade de la Queue de Cheval waterfall (yellow markings) on a downhill path.
(5) After crossing a stream, turn left towards a bridge (the path on the right will be used later), then quickly take the path on the right towards the waterfall.
Further up, cross another bridge on the right: cross a meadow and then continue through the undergrowth on a path (marked in yellow).
(6) Arrive at the beautiful Queue de Cheval waterfall.
Retrace your steps: after the bridge, turn left twice, then cross the bridge (which you saw on the way there).
(5) Continue straight ahead (no signpost here) on a pleasant path with a gentle uphill slope. After fording the river a little further on, the path climbs steeply to overlook the river.
Further on, the path bends sharply to the right to join another path higher up via a few small meanders.
(7) At the fork, take the wide path on the right. The route then continues through the woods with a generally gentle slope. Further on, keep an eye out for a fork in the path.
(8) Take the forest track on the left, marked by a cairn at the start. The track climbs gently and then descends slightly. After a while, keep an eye out for another fork.
(9) Take the path on the left, marked by a cairn. The fairly steep slope continues until you reach a few small rock faces: cables in good condition allow you to negotiate the few tricky sections (using your hands if necessary). Take care!
(10) After a less strenuous stretch, you will suddenly emerge from the forest: from here, you can enjoy a beautiful view in a relatively open environment; you may want to descend a little to the right.
Continue along the path on the left: you will soon reach another wider path (Route des Diots du Jura): turn left and continue uphill.
(11) Not far away, you will reach the Belvédère de la Pointe de la Roche (a particularly beautiful viewpoint overlooking the Cascade de la Queue de Cheval waterfall). According to the sign, this spot, located at an altitude of 1,100 metres, is the highest point of the hike.
Return to the previous junction: continue straight ahead to reach a farm visible below. Further down, you will then reach a clearly visible path.
(12) At Sur la Roche: take the path on the right towards Le Replan (follow the yellow markings and the Diots du Jura trail). After a short descent, the path climbs again. Approach the end of the road: turn right to reach the Belvédère du Replan viewpoint, which offers another beautiful view.
(13) Go back a little and continue along one of the two small roads on the right (which run parallel to each other) to reach a T-junction.
(14) Arrive at Le Replan near the village of Septmoncel.
Continue to the right and go straight on along Chemin des Moines (the old road between Saint-Claude and Septmoncel until 1884). After a short while, you will reach the hamlet of Montbrilland below.
Join the RD436 road (take care): continue along this road to the right, heading downhill and passing an old mill.
(15) After a car park (on the left), take an uphill path on the right. At the top of the hill, continue almost straight ahead downhill through a wooded area. Ignore a path on the right, then turn right at another intersection.
After ignoring a path on the right, take a path to the right at a bend (this is a recent development and visibility is poor at the start of the section - caution): the path is gently sloping at first, then becomes steeper. Further down, you will reach a path: follow it to the left, walking easily along the river. Return to the starting point (S/E).