Mont Valezan, Mountain summit between Séez and La Thuile, France and Italy

Mont Valezan is a mountain summit at 2,891 meters that marks the natural border between France and Italy in the Savoie Mont Blanc region of the Alps. The peak can be accessed from hiking routes on both the French and Italian sides of the frontier.

Mont Valezan was long known as Chardonney and later as Mont Valaisan, names recorded before the current form. Its summit, at 2,891 metres, lies on the Franco-Italian frontier between the communes of Séez and Montvalezan in Savoie and La Thuile in the Aosta Valley. The boundary line follows the ridge, placing the peak between the two states.

The summit's three flanks fall into three different communes: Séez and Montvalezan in Savoie, and La Thuile in the Aosta Valley. The mountain also carries three names in use — Mont Valezan, Mont Valaisan and the older Chardonney — and the Italian side is called monte Valaisan. Its north-western face rises directly above the col du Petit-Saint-Bernard, the historic pass linking the Tarentaise with the Aosta Valley.

Mont Valezan rises above the Col du Petit-Saint-Bernard to the northwest and the La Rosière ski area to the south, so approaches start from the French side near Les Eucherts or from La Thuile in the Aosta Valley. The summit stands at 2,891 m, and the Italian east side holds a small glacier, so snow can linger on that flank into summer.

The peak is accessible from both sides of the border, allowing hikers to choose their starting point on either the French or Italian side. This dual-access nature gives visitors flexibility in planning their ascent route.