The 4,805.59-meter altitude of Mont Blanc recorded in 2023 was the lowest measurement since 2001.
Notes on verification
Multiple independent, high-quality sources (AFP wire coverage, France24, EcoWatch, Outside Online, Chamonix.net, Journal du Geek) consistently confirm the 4,805.59m measurement and its status as the lowest since 2001, cross-checked against the full historical GPS survey series. [tier=silver indep_score=0.554 clusters=6 claim_tier=notable | framework convergence=single on biennial GPS/GNSS-based summit survey conducted by Haute-Savoie surveyors since 2001 (upstreams: Chambre Départementale des Géomètres-Experts de la Haute-Savoie, IGN (Institut national de l'information géographique et forestière)) — publishers independent, evidence may not be | kind=empirical eligibility=high (extractor: empirical/medium)]
Sources
- Une expédition pour mesurer la pesanteur sur le mont Blanc - Portail IGN - IGN (seed:geography_and_travel)
- https://www.ecowatch.com/mont-blanc-shrinking-2023.html (corroboration)
- https://www.outsideonline.com/outdoor-adventure/environment/mont-blanc-is-shrinking/ (corroboration)
- https://www.journaldugeek.com/2023/10/06/la-derniere-mesure-du-mont-blanc-lamene-a-un-niveau-record/ (corroboration)
- https://www.france24.com/en/france/20231005-france-s-tallest-mountain-mont-blanc-has-shrunk-by-more-than-two-metres-in-two-years (corroboration)
- https://www.chamonix.net/english/news/mont-blanc-has-lost-more-2-meters-two-years-current-height-480559-meters (corroboration)
- https://blog.alpine-property.com/tag/height-of-mont-blanc/ (corroboration)