On the access road to the Fontanettes chalet restaurant, park in the car park at the end of the paved section of road.
(S/E) From there, follow the track to the Chalet des Fontanettes. Shortly before the end of a wooded area, ignore a path coming from the left. At the next junction, turn left.
(1) When you reach the Chalet des Fontanettes, follow the track on the right, which winds its way up to the Chalet de l'Aulp de Marlens.
(2). From the chalet, follow the small path eastwards which joins the foot of the valley through the mountain pasture and begins to climb up the hillside.
(3) After an initial climb up the left side of the valley, at the fork, continue on the left-hand path (ignore the shortcut to the right that leads to Mont Charvin, which is slippery and very steep). Continue on the left side of the valley until you reach a flat area where there is a sign indicating the path to Mont Charvin.
(4) Ignore the path to Mont Charvin and turn left onto the western slope of Col des Porthets.
(5) When you reach the ridge, turn right (east; beautiful view of the Manigod valley). An almost flat traverse allows you to catch your breath before the final slope that leads to the pass, the highest point of the hike.
(6) From Col des Porthets, continue east-northeast, descend the switchbacks on the rocky slope and cross at the foot of a rock (possibility of snow until the end of July). The path, which is well marked but not shown on the 1:25,000 map (only visible when zooming in), leads you to the path that climbs up from Manigod.
(7) Continue eastwards to Lac du Mont Charvin, well protected by the surrounding ridges and peaks.
(8) Return via the same route, taking particular care on the descent after the Col des Porthets as the path is often slippery. This will take you back to the car park (S/E).

