View source for 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 = <ref name="peakbagger">{{cite web|url=http://www.peakbagger.com/peak.aspx?pid=13701|title=Grand Som - peakbagger|publisher=peakbagger.com|accessdate=4 February 2015}}</ref>
| range = [[Chartreuse Mountains]]
| location = [[Isère]], [[France]]
| 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 = <!-- frwiki -->
| 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.<ref>{{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|page=63-64|access-date=2017-06-13}}.</ref>
[[File:Col de la Ruchère et Petit Som.JPG|thumb|center|upright=3.2|View from the [[col de la Ruchère]] 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 Isère]]
[[Category:Mountains of the Alps]]
[[Category:Chartreuse Mountains]]
[[Category:Two-thousanders of France]]
{{Isère-geo-stub}}