Below the Chivasso Refuge, in the straight line of the plateau that goes towards Lake Nivolet, on the left you’ll find the signs indicating the start of the trail.

It gains altitude in the meadows and then, a few minutes later, branches off to the right towards the mountain pasture building. The path continues, taking a moderate slope and then runs along Lake Rosset to the right. It becomes steeper up to the 2954m point to lose a little altitude when entering the Leynir Valley. Cross it and then climb back up on the right-hand shoulder. The final climb is on sandy ground which connects to the pass located at 3090m.

Like the tour of Mont Blanc, Col Leynir, via Col du Nivolet, is a popular route for mountain bikers because there are not too many big slopes or technical difficulties.

The trail begins with a steep descent over detrital terrain marked by cairns. By making a semicircle, you can cross this moraine along the side of a few lakes. Then, there’s grassy terrain that descends to the upper Vaudalettaz alpine chalet located at 2444 metres.

After passing the alpine chalet, lose a few dozen more metres, cross the stream to go back up 100m of ascent on the opposite bank. From there, you can enjoy a magnificent view over the Col Leynir Valley that you have walked through, over the Rosset Valley and Rhêmes Valley. The path descends on the other side and, after 150m of ascent, it arrives just above the Grande Vaudalaz. After passing the Grand Vaudalaz stream, a diagonal takes you up to 2407m where a promontory offers a magnificent view over the Rhêmes Valley. A second traverse descends the grassy slopes to pass the farm to head straight on towards the Benevolo Refuge.

To reach the final destination of the Thumel car park, from the Vaudalettaz mountain pasture, cross the stream and continue along the path on the left which descends in hairpins towards the forest to the plain where you join the road which leads to the car park.