Start at the Croix du Sable Villette, in the commune of La Biolle.
(S/E) Cross the hamlet, passing between the Meyrieu campsites. When you reach the second hairpin bend on the forest track, take the path in the middle of the bend and continue to La Chambotte.
(1) At Chemin de la Corne, turn right onto the D991B towards Saint-Germain-la-Chambotte until you reach the second track on the left.
(2) Follow this track to the junction with the D58 at the entrance to Laval-Dessous.
(3) At Chemin des Combales, follow the D58 carefully until you reach Laval-Dessus.
(4) At the bend in the road, take the track that runs between the houses and follow it to the junction with the D54.
(5) At the Croix de Mission on the D54, take the path opposite the cross and then turn onto the first path going uphill on the left (marked MTB route no. 10).
(6) At the three-way junction, turn left, heading due east.
(7) At La Source, turn right onto the gravel track which becomes a tarmac road all the way to Collonges.
(8) Follow the path that descends alongside a private swimming pool and take this path to Le Mollard
(9) Go round the houses on the right and take the climb up the road towards Mondurand (Les Bois).
(10) At the Montée du Mondurand, turn left onto the road, then take the path towards Mondurand-Dessus.
(11) Turn onto the path on the left. This leads to the D991B.
(12) Follow this road carefully until you reach the Croix du Sable (S/E).
I did this walk in gloomy weather, as it had rained heavily the day before, making the paths slippery and muddy; particularly before point 12, the descent was impassable over a short stretch that was impossible to bypass, with barbed wire on both sides. In my opinion, at Le Mollard it’s better to take the small road down to the village of Lépau to join the D991c from Rumilly which climbs up to La Villette, but there’s a lot of traffic on Sundays; it’s two kilometres shorter on the route – I did it last year.
A lovely walk, but there weren’t many signposts to help you follow the path – you really need to use your satnav to stay on track. At point 8, I made a mistake: I went straight down the hill and didn’t want to turn back, so I went through the village of Lépau to join the D991c. It wasn’t the best choice, as it was very busy, though fortunately it wasn’t a long stretch – just 2 km.