Depart from the car park at the entrance to the village of Bourg-de-Sirod, next to the town hall.
(S/E) At the car park, follow the signpost for Nozeroy and climb the path to the fortified gate of Richebourg. This is one of the old salt roads where convoys on their way to Switzerland paid the salt tax.
(1) After the fortified gate, at the signpost, follow the direction of Nozeroy to the left along the path that climbs uphill. At the Roches Graviers signpost, continue straight on towards Nozeroy along the ridge and you will reach the ruins of Château Villain.
(2) Continue along the ridge on a pleasant path until you reach a fork where the slope levels out.
(3) Turn right and follow the path to the road. At the sign for "suivre Nozeroy" (follow Nozeroy), go 200 metres to the right and you will reach a hairpin bend to the left. You will see the signpost for "aux Combes".
(4) Turn right towards "Escalier des Coucous" then quickly take a path in the field on the left that runs alongside the track. Follow the edge on the right-hand side to the end. Climb over the fence using the rock then walk a few metres to the left to the viewpoint.
Then retrace your steps to the rock and take the path straight ahead. Descend to reach the Escalier des Coucous.
(5) At the bottom of the stairs, turn left (there is currently no signpost for "Rocher des Commères"). Pass between large boulders with vegetation that changes frequently.
(6) At Rocher des Commères, continue along the path downhill. Pass through a coniferous forest, then a field, and arrive at an intersection with a road. Take the small path opposite that goes downhill and join the fork with a signpost.
(7) Continue to the right, towards Nozeroy, until you reach the castle chapel via Rue les Chaffaux.
(8) Continue along the path towards Nozeroy for 100 metres and turn left at the "Richebourg" signpost. Follow the signs for "Sous le Mou", walk for 300 metres and at the "Sous le Mou" signpost, turn left towards "les Tufs".
At the cross path overlooking the Ain, turn left. Cross the Ain bridge (EDF structure) and continue to the Source des Tufs.
(9) Continue along the path and at the next intersection, at the "les Tufs" signpost, turn left towards "Côte Poire". When you reach the tarmac, ignore it and continue along the path on the left. This path goes around the Côte Poire ridge and comes back down the other side of the slope. At the three-way junction, turn right and continue to the intersection with the "Côte Poire" signpost.
(10) Take the path on the left towards "Syam". You will reach a hairpin bend in the road. Ignore the road and take the path on the right. You will reach La Roche des Sarrasins.
(11) Pass between the two blocks of rock and continue along the path to the road. Follow it to the right and enter the village of Syam. Reach the fork in the road just after the church, with a fountain in the centre.
(12) Turn left onto Rue du Lavoir, which runs alongside the church. At the next intersection, turn right and descend to the crossroad below. Turn right, ignore a road on the left and find a path on the left just after the house. Follow this path, which begins with a flight of steps, and climb up to the Chapel of Notre-Dame de la Paix.
(13) Continue downhill along the path next to the chapel and join Rue des Scilles. Turn right onto the D127, Rue des Sarrazins, and turn left.
(14) After the local girls' school, continue along the path on the right for about 3 km until you reach the signpost for "Les Forges". With the Ain river on your left, walk along it to the bridge and back to admire the scenery.
Back at the "les Forges" signpost, follow the sign for "Perte de l'Ain à 200 m" on the left. Continue to the next fork.
(15) Turn left for a round trip and arrive at the Perte de l'Ain. Retrace your steps.
(15) On your return, turn left towards "la Passerelle" and cross the Ain.
(16) Continue and further on, at the "Côte du Martinet" signpost, turn left towards "Bourg de Sirod" and reach the Chambre d'Eau. The water is channelled to supply a hydroelectric power station.
(17) Continue along the path and you will reach the town hall on your right (S/E).