Cornebois, Mountain summit at France-Switzerland border near Monthey, Switzerland.
Cornebois is a mountain summit on the France-Switzerland border rising to approximately 2200 meters in elevation. The terrain consists of sedimentary rock formations that span across the Valais and Haute-Savoie regions.
The mountain formed millions of years ago as part of the Breche nappe system that shaped the present Alpine landscape. This geological structure developed during major tectonic shifts that defined the entire region.
The summit welcomes climbers from both Switzerland and France who share routes and local knowledge across the border. These cross-border connections have shaped common hiking practices between the neighboring communities.
Hikers can reach the summit from Monthey in Switzerland or Chatel in France, both offering marked trails for the ascent. The best time to visit is during snow-free months when trail conditions are most favorable.
The summit sits within the Chablais Geopark and displays distinct geological features from both French and Swiss territories. Visitors notice the striking rock layers that reveal the complex story of Alpine mountain building.
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