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Chamonix-Mont-Blanc, more commonly known simply as Chamonix (formerly also spelled Chamounix), is a commune in the Haute-Savoie département in the Rhône-Alpes region in south-eastern France. It was the site of the first Winter Olympics in 1924. The commune's population of around 9,800 ranks 865th within the country of France.

Situated near the massive peaks of the Aiguilles Rouges and most notably the Aiguille du Midi, Chamonix is one of the oldest ski resorts in France and is known as the "gateway to the European Cascades." The north side of the summit of Mont Blanc, and therefore the summit itself are part of the village of Chamonix. To the south side, the situation is different depending on the country. Italy considers that the border passes through the top. France considers that the boundary runs along the rocky Tournette under the summit cap, placing it entirely in French territory. The south side was in France, assigned to the commune of Saint-Gervais-les-Bains sharing the summit with its neighbor Chamonix. It is this situation "for France," which is found on the French IGN maps. The Chamonix commune is well known and loved by skiers and mountain enthusiasts of all types, and via the cable car lift to the Aiguille du Midi it is possible to access the world famous off-piste skirun of the Vallée Blanche. With an area of 245 km² (95 sq mi), Chamonix is the fourth largest commune in mainland France.

Chamonix is a popular winter sports resort town in France. As the highest European mountain west of Russia, Mont Blanc holds a special allure for mountain climbers, and Mark Twight described the town as "the death-sport capital of the world" because it is a base for almost all types of outdoor activity, especially their more extreme variants, such as ice climbing, rock climbing, extreme skiing, paragliding, rafting, canyoning and Wingsuit flying.

Chamonix is famous for its spectacular cable car up to the Aiguille du Midi 3,842 m (12,605 ft). Constructed in 1955, it was then the highest cable car in the world. Together with a cable car system going up to the Pointe Helbronner 3,462 m (11,358 ft) from Entréves in the Aosta Valley (Italy) it is possible to cross the entire Mont Blanc massif by cable car (the latter is only open during the summer).

In the summer months Chamonix is a mecca for alpine mountaineers, drawn to the area by challenges like the north, west and south-west faces of the Dru, the Frendo Spur on the Aiguille du Midi, the north face of the Grandes Jorasses and the massive face climbs on the south side of Mont Blanc. Traversing the Alps on the GR 5 footpath or more accessible challenges like reaching the summit of Mont Blanc (by a number of possible routes) are also popular.

On 12 July 2012, at least nine climbers-three from the United Kingdom, two from Switzerland, two from Germany, and two from Spain-were killed by an avalanche as they attempted a dawn ascent of Mont Maudit. Nine others were injured and flown to hospital, while four remained missing. The avalanche struck at 5am, as the climbers began their climb up one of the most popular, but dangerous, routes up the mountain. Éric Fournier, the maire of Chamonix-Mont Blanc, described the snowslide as one of the deadliest in recent years. "There was no weather bulletin giving any avalanche warning," he claimed.

Chamonix is also a destination for mountain bikers. Besides the obvious lift-assisted areas for Freeriders there are hundreds of kilometres of challenging hidden singletrack trails - often only found with the help of guides, although since the summer of 2008 mountain biking is only permitted on a small selection of trails during July and August.