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Car park in the hamlet of Laisonnay d'en Bas.
(S/E) From the car park, continue along the road for 200 metres towards the hamlet of Laisonnay d'en Haut.
(1) Take the path that climbs left towards the impressive Py waterfall. Several switchbacks make it easy to climb the steep slope of the Couloir Noir on the left bank of the Ruisseau du Py. The slope levels out and you reach a narrow plateau dominated by the Couloirs du Mollard, the Arête du Mollard and the Roche de Blamont (2,580m). The path continues along the left bank of the Ruisseau du Py at a stone bridge (sign - chalet).
(2) Cross the stream. The valley widens and the trail continues through alpine meadows populated by numerous ibex before reaching the Refuge de Plaisance (2160m).
(3) After the refuge, continue to the right along the path towards Col de Plan Séry. At around 2480m, cross Plan Séry before arriving at Col de Plan Séry itself (2609m).
(4) Continue towards Rosuel (north-east), losing a few hundred metres in altitude.
(5) At the crossroads at an altitude of 2,320 metres, follow the path that branches off to the right. This east-facing balcony overlooks Lac de la Plagne, passes north of Aiguille de Bacque and then crosses a scree slope.
(6) Then join theGR®5(red and white markings) and follow it to the right, heading south, leaving several paths on either side to reach Lac de Grattaleu (2,512m).
(7) After the lake, follow the path on the left and, with one last effort, reach the Col du Palet (2,652 m).
(8) Leave the Col du Palet by turning right towards the south-west to reach the Col de la Croix des Frêtes (2,647 m).
(9) From here (and throughout the descent), you will have views of the Grande Casse, the Aiguille de l'Épéna, the Pointe de la Grande Glière, etc. From the Col de la Croix des Frêtes, continue along a small path heading south-west, which passes by the Lac du Grand Plan (2,480 m).
(10) Continue along the same path to the south-west before joining the track near the Chalet des Gardes (2,289 m).
(11) Follow the west-southwest track and leave the Chalet du Plan du Sel on your right. At a right-hand bend, leave the track on the left and take a winding path. At a hairpin bend in the track, turn left (east). Cross the track again and descend to Lac de la Glière (chapel).
(12) From the lake, head west to the Refuge de la Glière and rejoin the track. Follow the track, cutting across a few bends in places, and head to the Refuge du Laisonnay.
(13) Continue to the Laisonnay d'en Haut crossroads.
(1) Turn left and arrive at Laisonnay d'en Bas (S/E).
Visorando member
Difficult 
Moderate 
Association / Club / Walk leader
