Park at the Prés Ronds car park (near the Col de la Forclaz).
(S/E) Head towards the Col de l'Aulp, either by road (accessible to some vehicles) or by taking the shortcuts through the meadows (easily recognisable as they are well-trodden). Then continue on to the Chalet de l'Aulp.
(1) Continue climbing up the steeply sloping meadow. Reach the Pierre-Chatelard cliff, which the trail bypasses on the right. The passage is magnificent because of the view of the lake. Enter the basin and find the Bionay-Dufour refuge. It is now closed.
(2) Continue towards the foot of the Casset wall, follow it and climb over its southern end. Change direction to reach the top of this wall, then the Col de Varo.
(3) Continue climbing using ledges and rock steps. Gradually climb the rocky ridges of the crest using passages equipped with cables. To reach the fauteuil, the rocky summit of the mountain, you will need to use two ladders (beware of vertigo). Then reach the summit of La Tournette.
(4) Retrace your steps to return to the Prés Ronds car park (S/E).
