At the Blainon chairlift exit, turn right towards the summit of Colombier (B172). Once you reach the Las Donnas cable car station, go back up to the left (B169).
Climb up to the small oratory (no higher), turn right to skirt the rocky summit of Las Donnas and join the wide trail behind the Las Donnas ridge (B170). Continue to the Col du Ciavalet at 2324m at the foot of Mont Riounet (2537m), turn right via the Col du Bouchiet (B151) and head for the small Lac de l'Estive (hillside reserve), which you will easily reach. At La Baisse (B153), you have two options:
- either descend the valley on the "Champ Roulon" trail, then at marker 15 join the small path to the Fossati bridge (B8). Cross the road and take the trail on the right that runs alongside the Riou to the tourist office.
- or for a complete loop, go back up to the Bercha balcony (Lieuson chairlift arrival point) to the Bercha summit (b152), then descend via the Auron summit (b4a), the Puy d'Auron (b6), and the Puy d'Auron path to the tourist office.
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