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Reach the Col du Joly via Hauteluce on the south-western slope. Park in the large car park at the pass.
(S/E) Head south-east towards Aiguille de Roselette and Col de la Fenêtre via theGR®5, Tour du Pays du Mont Blanc. Pass the arrival point of a ski lift on the right, then another ski lift on the left. Climb up to the Tête du Lac de Roselette.
(1) Continue eastwards and pass above the arrival point of the Roselette chairlift. Turn south-east. At the arrival point of the Bûche Croisée chairlift, ignore a trail starting on the right, continue south-east and reach the Aiguille de Roselette at an altitude of 2134 metres.
(2) Then turn south to pass under the west face of the Aiguille de Roselette on an easy traverse trail.
(3) At the junction, turn left (east) and climb up the slope to reach the Col de la Fenêtre.
At the pass, climb up to the right for a few metres to enjoy the best possible view of the surrounding area: the Mont Blanc massif is directly east in front of you.
(4) Return via the same route in reverse. Take care on the few descents between the rocks. This will bring you back to the Col du Joly (S/E).
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Difficult 
