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In Le Petit-Bornand-les-Glières, specifically in the Crêt district, take the road leading to the village of Puze, which ends at the Cenise car park.
(S/E) From the car park, follow the wide track that climbs towards the Col de Cenise, up to the second hairpin bend after the Refuge de Cenise.
(1) After leaving the track, head straight up into the mountain pasture heading south-east. After crossing the two access paths to the chalets, head east-south-east until you find a more clearly marked path. Don’t hesitate to use your compass during this first section, as the numerous animal tracks and lack of markings can be misleading.
Join the path coming from the Col de Cenise.
(2) Begin a steep climb between the rocky outcrops to reach a first pass at the foot of the Pointe de Sosay. Although it may look daunting, this section presents neither difficulty nor real danger in dry weather.
(3) Continue to the right, leaving the path on the left that climbs towards the Col du Rasoir and the Pic de Jallouvre, to reach a pond.
(4) After the pool, the path has disappeared beneath a vast scree slope, the result of the 2015 rockfall. Cross the scree slope horizontally in a south-south-westerly direction. Finding your way is not particularly difficult, as the path leading up to the pass is clearly visible at the end of the scree slope (furthermore, a few cairns have been placed along the crossing).
At the end of the scree slope, the most exposed section of the route begins. It presents no major difficulty in dry weather, but can be dangerous in wet conditions. It is not recommended to bring young children or people prone to vertigo here. After about a hundred metres, you reach the Col de Sosay.
(5) Climb for about a hundred metres north-westwards, following the ridge to reach a small viewpoint.
(6) Alternatively, descend gently through the mountain pasture towards the chalets.
(7) You’ll reach Lake Lessy; the only difficulty is the stinging nettles lining the edge of the path.
(6) Return to Cenise via the same route as on the way out (S/E).
Visorando Member
Moderate 
Association / Club / Walk leader
Very difficult 
