Boucle du Grand Som

Equipment : Pedestrian sports, Hiking itinerary

This path overhangs the Monastery of La Grande Chartreuse. You may encounter a monk on your way! Amazing viewpoint from the top.

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The path starts at the end of the car park. Follow the GR Tour de Chartreuse (white and red) signs to the «Habert de Bovinant». Take the path that leaves the track on the right (1). At the Habert de Bovinant, follow «Le Grand Som» (2). From this point, it will take you about 2 hours to get to the the top and to come back on yourself, with some challenging passages. At the Col de Bovinant, turn right and follow the yellow signs to the top. For the way down, follow «La Correrie». At the junction «1,530 m», follow «Pas du Loup» (3) and «Col de La Ruchère». The Pas du Loup is a challenging passage. If you want to go down in an easier and in a more direct way, keep following «La Correrie». At the Col de la Ruchère (4), follow «La Correrie».

Ligne T40 (St Pierre de Chartreuse - Grenoble)
En période de vacances été le conducteur vous dépose à la demande à proximité du musée de la Grande Chartreuse sur les départs de Grenoble à 8H40, 12H30 ET 14h15 en semaine et toute l'année les samedis à 8h40, 12h30 et les dimanches et jours fériés à 8H35 et 14h15.


Free of charge.

Opening periods

From 01/05 to 31/10.

Subject to favorable weather.

Equipments and characteristics

  • Pets refused

Track characteristics

18 km
Positive level difference:
1500 m
Daily duration:
Level black - very hard