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By car: Take the D512 road connecting Grenoble to Saint-Pierre-de-Charteuse. About 200 m north of the Col de Porte, turn towards Charmant Som on the D57d. After 300 m, on a flat section, ignore the road on the left and continue straight ahead on the D57e. Park at the end of the road in the Chalets de Charmant Som car park.
(S/E) From the Chalets car park (1,646 m), head to the end of the road and follow the yellow markings towards Charmant Som.
(1) After about 500 m, at the intersection sign, ignore theGR® de Pays trail on the right towards the small pass and continue climbing straight ahead to reach a secondary summit (altitude 1,830 m). After a short descent followed by an ascent, you will reach the summit of Charmant Som (altitude 1,867 m), where you can enjoy a superb view, including the western slope of Chamechaude.
(2) From here, the trail is no longer marked. Take the northern trail to the right of the summit cross. There is a faded green paint mark on a flat rock indicating the start of the trail. The well-marked trail leads to a gap. Descend between the rocks (north-west), then leave the trail after a right-hand bend. Descend diagonally down a grassy slope, then, after a flat section (altitude 1,720 m), join a path to the north.
(3) At the intersection, continue north towards a pass overlooking the Guiers Mort valley. This promontory offers an impressive view of the steep-sided Guiers Mort valley and, in the distance, the Grande Chartreuse monastery.
Retrace your steps to the intersection of the promontory trail.
(3). Leave the previous trail and take the one on the right. Descend into a valley and, in a wide circular loop, cross it to reach the opposite side. Climb (west) up a stony trail along the foot of a rocky ridge to its highest point (altitude 1,700 m).
(4) Turn left to cross the meadows, which are almost level, then descend into a cirque enclosed by a cliff. Follow it and, via a few hairpin bends, climb up to the Chalets de Charmant Som (S/E).
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