There are many iconic climbs regularly used by the Tour de France. There are also many lessor climbs.
The cache can be found at:
N50 (Cote de La Glacerie + Col du Perthos) (Cote de Capvern + Col d'Aspin + Col de Peyresourde) .
(Port de la Bonaigua - Port del Canto) Port d'Envalira Col des Trios Termes
E000 (Col des Mosses - Col de la Forclaz) (Col de Neronne + Hourquette d'Ancizan + Col de Val Louron Azet) .
(Cote de la Comela + Port d'Envalira + Col du Bertiand) (Lacets du Grand Colombier x2) (Cote de Saanenmoser - (St Gervais Mont Blanc Le Bettex x3))
The cache is placed in accordance to the GAGB's landowner agreement with the Forestry Commission East England Forest District.
'The landowner (Forestry Commission East England) does not assess the suitability or safety of the cache location. The cache placer and the cache finder have a responsibility to take reasonable precautions to protect their own safety and the safety of others. Hazards observed at or on route to the cache location should be reported to the cache placer’
You can validate your puzzle solution with certitude.