Chamonix (shämônēˈ) [key], town (1990 pop. 10,062), Haute-Savoie dept., E France, at the foot of Mont Blanc. The principal base for climbing Mont Blanc and for visiting the Mer de Glace, it is a popular summer and winter resort. The Chamonix valley was the site of the 1924 Winter Olympics. It has the world's highest (12,605 ft/3,842 m) aerial cable car and is linked by tunnel (7.5 mi/12.1 km) with Courmayeur, Italy.