At Le Touvet, take the tree-lined road leading up to Château du Touvet, pass the castle entrance and park 150 m further on, at the crossroads; there are four to five spaces available before the bridge (which is very narrow). Alternatively, park in the hamlet of Le Vivier by turning left at this crossroads.
(S/E) Head to the hamlet of Le Vivier and follow the Chemin des Fontaines, which becomes a good path climbing gently. Reach a stream and follow it up the right bank.
(1) Cross the footbridge and continue along the flat path towards the old church or Montalieu. Ignore the side paths leading uphill to the left.
(2) Above the old church of Saint-Vincent de Mercuze, take the path on the left, which climbs steadily. Follow this undulating path.
(3) On reaching Montalieu, above the torrent, turn left onto the Chemin d’Autrefois, which descends for a few dozen metres before climbing back up the Ruisseau d’Alloix via several footbridges.
At the ruins of a mill on the left bank, leave the gorge via a path climbing to the right. Join a wider path and descend, turning right. It soon leaves the gorges to reach the village of Montalieu on the left bank.
(4) Walk down the tarmac road to the pretty wash house and retrace your steps for 30 m before turning left and crossing over the stream, 50 m upstream of the bridge on the D9 road. Follow the straight, level path.
(5) At the White Cross, head slightly uphill to the right to continue along the small tarmac road which climbs gently towards the old church mentioned.
Take the path that descends below the old church and head towards the town hall of Saint-Vincent-de-Mercuze.
(6) Pass the town hall on your right and continue straight ahead; then, 150 m further on, climb 10 m to the right and continue straight ahead, cross a narrow bridge and reach the car park (S/E), or the hamlet of Le Vivier, which is 100 m beyond the bridge.