Grand Som

It has a long ridge, unevenly sharp, overlooking the Petit Som (1,772m), the Col de la Ruchère northwest and the Grande Chartreuse monastery below the cliffs.

It lies in the Parc Naturel Régional de la Chartreuse.

Many chasms are present on the massif: Trou Lisse à Combonne (−303 m), puits de l'Écho (−396 m), gouffre Roland (−481 m), gouffre de Mauvernay (−507 m), gouffre des Aures (−512 m), , but the most important network is the puits Francis (1,565 m) or Réseau de Bovinant [fr] of 723 meters deep for 6,836 m of development.

Discovered in July 1966 by the caving club of La Tronche (FLT), the siphon at (−688 m) was reached on August 23, 1967.

[2] This Isère geographical article is a stub.

View from the col de la Ruchère to the Petit Som (1,772 metres (5,814 ft), on the left) and the summit of the Grand Som (on the right).