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Cerin can be reached by climbing from Lhuis or from Serrières-de-Briord via Lompnas. Park in the small car park in front of the paleoecological museum.
(S/E) Opposite the car park, head west down Rue du Clos to the bottom of the valley and cross the Brive river at an old mill.
(1) Climb up the steep forest path opposite, which cuts across a track and then curves, levelling out before reaching the road at the hamlet of Vercra.
(2) Turn right. The road becomes stony and descends gradually, veering to the left. On the slope, it winds through the forest (which can be shortened by taking a shortcut) then takes a second left to descend to the vineyards at Pinivon.
The path enters the forest again, passes a crossroads overlooking the Haute-Roche stream and, 100 m further on, reaches an open bend before plunging back into the forest on the right.
(3) From this bend, a path branches off to the left, descending towards the stream and reaching the top of the Chosas waterfall (caution: the path leads directly to the cliff).
(4) Several paths allow you to return, but given their condition (fallen trees), the easiest option is to turn back to the marked path.
(This detour to the top of the Chosas waterfall off the marked trail is optional for those who are unsure about venturing there.)
(3) Take the marked path that descends to the northeast, then after a ravine, turn northwest and then north to descend the Courtaudière to the Brive, which is equipped with a footbridge.
(5) Climb up the steep path opposite the slope, which leads to a paved road coming from Chosaz, the Chemin du Grapillon.
(6) Take it on the right; it crosses cultivated fields and enters the forest again. Continue straight ahead eastwards to descend to the Brive and stay on the right bank of the stream, leaving the paths to the left. The trail thus reaches the beautiful Brive waterfall and its basin.
(7) Climb up to the left along the cliffs to get over a rocky outcrop, then the path flattens out and even descends again towards the Brive to reach an old mill (ruins and millstone) and then a bridge crossing the Ruisseau du Gros Pertuis.
(8) Once you have crossed the bridge, climb up the wide path opposite, which joins a forest road, leaving the Brive on your right. At the top of this climb, turn right at the crossroads onto a carriage road that climbs in wide bends to leave the forest and enter Marchamp.
(9) Cross the village and climb above the cemetery to a junction at Luèpe.
(10) Take the small road (Chemin de Lueppe) down to the right to Cerin, where you take the Rue Principale to the museum (S/E).
. The path that continues towards Marchamps, to the left of the waterfall, is difficult for about 200 metres and impressive because it is practically on the side of a cliff. I wouldn't risk it in wet weather... After that, you return to the restful undergrowth along the river. The return between Marchamps and Cerin is very exposed to the heat and has very little shade.
Visorando member
Easy 
Very difficult 
