The altitude of Mont Blanc was measured at 4,805.59 meters by geometer-experts of Haute-Savoie in autumn 2023.
Notes on verification
Confirmed by multiple independent French news sources (Le Temps/AFP, France 3 Régions) and cross-checked with Wikipedia's infobox figure. Details on methodology, date, and personnel are consistent across sources. [cascade flags: wikipedia_dropped_other_sources_exist | tier=bronze indep_score=0.525 clusters=3 claim_tier=notable | framework convergence=single on Biennial official survey conducted by the Haute-Savoie surveyors' association (Chambre Départementale des Géomètres-Experts de la Haute-Savoie) (upstreams: Chambre Départementale des Géomètres-Experts de la Haute-Savoie) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- Une expédition pour mesurer la pesanteur sur le mont Blanc - Portail IGN - IGN (seed:geography_and_travel)
- https://www.letemps.ch/sciences/le-mont-blanc-source-de-fascination-perd-2-metres (corroboration)
- https://france3-regions.franceinfo.fr/auvergne-rhone-alpes/haute-savoie/chamonix/le-sommet-du-mont-blanc-a-perdu-de-la-hauteur-decouvrez-sa-nouvelle-mesure-2850800.html (corroboration)
- https://www.iloveski.org/en/2023/10/06/mont-blanc-altitude/ (corroboration)