The Marathon du Mont-Blanc is an annual trail running event held in the Chamonix Valley, France. It typically takes place in late June and attracts thousands of runners from around the world. The race covers various distances, with the main marathon stretching approximately 42 kilometers and featuring challenging mountain terrain. Participants navigate stunning landscapes, including views of the iconic Mont Blanc, the highest peak in the Alps. The event promotes outdoor sports and encourages a spirit of camaraderie among athletes, making it a highlight in the trail running calendar.