Grand Som
{{Infobox mountain
| name = Grand Som
| photo =Le Grand Som depuis le sommet du Charmant Som.jpg
| photo_caption =The Grand Som from the Charmant Som.
| elevation_m = 2026
| elevation_ref =
| prominence_m = 887
| prominence_ref = {{cite web|url=http://www.peakbagger.com/peak.aspx?pid=13701|title=Grand Som - peakbagger|publisher=peakbagger.com|accessdate=4 February 2015}}
| range = Chartreuse Mountains
| map = Alps
| range_coordinates =
| map_caption = Location in the Alps
| coordinates = {{coord|45|22|14|N|05|48|43|E|type:mountain_region:FR_scale:100000|format=dms|display=inline,title}}
| coordinates_ref =
| type =
| first_ascent =
| easiest_route =
}}
The Grand Som is a mountain of the Chartreuse Mountains in the French Prealps, in Isère, France. 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. The summit has a cross and two relief tables. It lies in the Parc Naturel Régional de la Chartreuse.
Caving
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 {{Interlanguage link|Réseau de Bovinant|fr|lt=Réseau de Bovinant}} 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. Upper entries were then found.{{Cite web|author1=Jean-Jacques Delannoy|author2=Richard Maire|language=fr|title=Les grandes cavités alpines. Répartition et contexte hydrogéologique|url=http://www.persee.fr/doc/karst_0751-7688_1984_num_3_1_2072|journal=revue Karstologia|date=1984|volume=3|pages=63–64|access-date=2017-06-13}}.
File:Col de la Ruchère et Petit Som.JPG to the Petit Som ({{convert|1772|m}}, on the left) and the summit of the Grand Som (on the right).]]
References
{{Commons category}}
{{reflist}}
Category:Mountains of the Alps
Category:Two-thousanders of France
{{Isère-geo-stub}}