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Departure and access:
On the D22 road, between the village of Habère-Poche and the Col de Terramon, take the road that leads to the Frastaz chairlift (sign): on the left when descending from the pass, on the right when ascending. Leave the chairlift departure station on your left and follow the Route de Durandet, which leads through forest and meadows to the hamlet of La Glappaz. At the hamlet, continue straight ahead (the road that climbs to the left towards the chalets is closed to traffic). After a right-hand bend, you will come to a T-junction. Turn left towards the small car park at the end of the road.
There are directional signs at some intersections. There are a few signposts with yellow arrows and, at the end, some very old traces of red and yellow markings: do not rely on these sparse markings for guidance.
(S/E) Continue along the road on the path towards Col de Creux (sign broken in July 2019). Climb between pastures and shrubs to reach Col de Creux.
(1) Turn sharply left and follow a stony track. Ignore the access to the Sur le Creux chalets on the right and continue along the track.
N.B. At point (2), the path marked in purple on the IGN map is lost in the vegetation, which has grown considerably. The following route is steeper but accessible.
(2) Just before the Paccot chalet, leave the track and turn left into a meadow. Look for a well-marked path to the north-east: join this path and climb the slope. Reach a fence and follow it on your left. Quickly move away from the fence and climb steeply.
Rejoin the old path (marked in purple on the map) and head south-east. Follow a few short hairpin bends and, at a fork, take the path on the right which leads directly to the ridge of Montagne d'Hirmentaz (base of an old cross).
(3) Follow the ridge northwards. Climb up and down several secondary peaks and, as you do so, step over a barbed wire fence. Climb to the true summit (1598 metres), descend, pass a marker post and reach a secondary summit (1594 metres).
(4) Descend the ridge, heading north-northeast. Pass the arrival point of a ski lift coming from the right and reach the arrival point of a chairlift coming from the left.
N.B. Between points (5) and (7), there are numerous intersecting trails and the 1:25,000 map is not always up to date. In particular, the trail that is supposed to start west at point (5) no longer exists (tall grass, brush, etc.).
(5) Continue north-east towards the Hirmentaz chalets. Pass the arrival point of a ski lift on your left, then go under the ski lift line. Shortly afterwards, at a fork, turn left. Then turn more sharply to the left and join a wide track. Follow this track westwards and then south-west.
(6) At a sort of plateau, turn right (north-northeast). At the edge of a cluster of spruce trees, make a sharp left turn. Descend on a good path and pass under the Frastaz chairlift line. Continue southwest towards some clearly visible chalets. Go through a gate in the fence to leave the mountain pasture at the Replan chalets (fountain).
(7) Then follow a wide track to the left towards La Glappaz. Descend gently through the forest. Pass the first chalets in La Glappaz and then a drinking trough on the left-hand side.
(8) At a hairpin bend to the right, go straight ahead on a path between two chalets (nos. 102 and 100). You will come out onto a small road (the one used for car access) and follow it to the left. At a T-junction, turn left towards the La Glappaz car park. After a short climb (note the beautiful chalets on either side), you will reach the car park (S/E).
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Difficult 
