Mont Granier, Limestone mountain summit in Chapareillan, France

Mont Granier is a 1,933-metre limestone mountain in the Chartreuse range, between Chapareillan in Isère and Entremont-le-Vieux in Savoie. Its north face is a sheer 700-metre cliff created by the 1248 collapse, while the east face drops toward the Grésivaudan valley. The summit crest is rounded and uneven, with pale grey and tan cliff bands above darker rock, ledges and a projecting spur.

The mountain served as a triangulation station in early surveying systems used to map the region. In 1248, a catastrophic landslide destroyed several villages when a massive limestone mass collapsed on the slopes.

The slopes support vineyards producing local Apremont and Abymes wines using the Jacquère grape variety grown here for centuries. This wine tradition shapes daily life and local identity in the villages below.

Multiple hiking trails start from the village and lead to the summit with varying difficulty levels for different abilities. The climb requires sturdy footwear and sure footing, especially on steeper sections with rocky ridges.

On 13 November 1988, cavers Pierre Guichebaron and Marc Papet found an extension of the Balme à Collomb cave at 1,700 m on the west side, holding the skeletons of over 1,000 cave bears dated between 24,000 and 45,000 years old. The massif itself is what remains of a larger plateau worn down by erosion.