La Tournette, Mountain summit and viewpoint in Les Clefs, Haute-Savoie, France

La Tournette is a limestone mountain in the Bornes Massif, reaching 2,350 m, with its summit on the border of Talloires-Montmin and Les Clefs. Its western face is barred by urgonian limestone cliffs, and the summit, called Le Fauteuil, is marked by a metal cross. The final ascent involves scrambling, with chains and two ladders fixed to a boulder.

Systematic exploration of the massif's caves began in the 1960s with the Spéléo Club de la Tournette, joined from 1979 by the Spéléo Club d'Annecy; since 2009 a team from Saint-Étienne has surveyed the whole massif. Nearly 90 cave entrances and about a hundred networks are recorded, the largest being the réseau des Praz d'zeures at 13 km long and 1,148 m deep. The Montée de la Tournette foot race has been held every year since 1996.

The summit is crowned by a metal cross on a rock called Le Fauteuil, at 2,350 m. The mountain lies between Lake Annecy and the Thônes basin, and its western flank belongs to Talloires-Montmin, the eastern to Les Clefs. Since 1996 a foot race, the Montée de la Tournette, is held here each year.

The nearest trailhead is the public car park at Prés Ronds; from there a well-marked path reaches the summit in about four hours. The last part of the climb requires scrambling, with chains and two ladders fixed to the summit boulder to help you up to the cross. The most frequented route starts from the col de l'Aulp, the highest road access, via the refuge de la Tournette. In winter, only the route from Belchamp via the refuge du Rosairy is practicable, on snowshoes or skis.

The summit is a boulder topped by a metal cross, reached by chains and two ladders fixed to the rock. The mountain also holds nearly 90 recorded cave entrances; the largest explored network, the Praz d'zeures, runs 13 kilometres and drops 1,148 metres.