Roc Lancrenaz, Mountain summit in Haute-Savoie, France

Roc Lancrenaz is a mountain in Haute-Savoie, rising to 1681 metres above Lake Annecy. Its summit is the southern end of a north-south urgonian limestone cliff, the eastern rim of a perched syncline; the Couturier ridge lies to the north. The top is bare grey rock; below, grass and scattered conifers slope down, crossed by pale dirt paths, with a small cluster of dark-roofed buildings low on the left.

Roc Lancrenaz lies on the crest of an urgonian limestone fold; its southern end is the summit, and the Couturier ridge runs north from it. The mountain marks the tripoint of Thônes, Alex and Talloires-Montmin. The GR 96 and the GRP Tour du Lac d'Annecy pass at the foot of the cliff between the col des Nantets and the aulp Riant, along the Pas de l'Aulp.

The GR 96 and the GRP Tour du Lac d'Annecy both run along the foot of the Lancrenaz cliff between the col des Nantets and the aulp Riant. On this stretch they form the Pas de l'Aulp, a short airy passage above Lake Annecy secured by chains fixed in the rock. The summit marks the tripoint of Thônes, Alex and Talloires-Montmin.

The main trail from Montmin covers about 9.6 km (6 mi) with roughly 840 meters (2750 ft) of elevation gain and is clearly marked on hiking maps. Wear sturdy boots and bring plenty of water, as the route includes steep sections that become slippery in wet weather.

The Pas de l'Aulp is a short, exposed ledge path that runs along the foot of the north-south cliff below the summit, between the col des Nantets and the aulp Riant. It is used by the GR 96 and the GRP Tour du Lac d'Annecy, and chains fixed in the rock secure the crossing above Lake Annecy.