
Team Mermillod Triathlon Half Iron
The Doussard Half Iron Triathlon is a sporting event held at the Sources du lac d’Annecy, part of the long-distance triathlon competitions inspired by the Half Ironman format. It takes place in the charming town of Doussard, located on the shores of Lake Annecy in Haute-Savoie.
This natural setting offers participants a spectacular backdrop, with the French Alps in the distance and the crystal-clear waters of Lake Annecy enhancing the experience.

Join us on Sunday, June 22, 2025, for the 17th edition of the Half Iron of Lake Annecy.
The beach of Doussard will host the event village, and the race will start at 8:30 AM.
🏊♀️ Swimming: 1.9 km in Lake Annecy, one of the purest in Europe!
🚴 Cycling: 90 km through iconic scenery, starting with a fast section, followed by a gentle climb, a rolling profile, and a final 12 km stretch along Lake Annecy to enjoy the stunning view! This cycling course is particularly challenging due to its climbs, notably the Col du Marais, a renowned ascent in the region with steep gradients that can make a difference in triathletes’ performances.
🏃 Running: 21.1 km through the surrounding countryside, offering breathtaking views of the lake and mountains.
After the effort, enjoy a mega buffet for all participants, featuring a real feast with bread, salmon, smoked ham, farmhouse reblochon cheese, salad, tabbouleh, organic yogurt, fruit, and more.
Recognized for its technical course and stunning environment, this triathlon attracts athletes from all backgrounds each year. Given the high demand for registration, it is advisable to secure your spot early. Visit the official website to get your bib and embark on this unforgettable sporting adventure!
Why come and cheer on the triathletes?
The Doussard Half Iron Triathlon attracts both amateur triathletes and seasoned competitors. The stunning setting and high-quality organization make this event a highly anticipated fixture in France’s long-distance triathlon calendar.
Additionally, its proximity to Lake Annecy makes it an appealing destination for participants’ families and spectators.
This demanding challenge combines physical endurance with the breathtaking beauty of the Alpine landscape, offering triathletes a truly unforgettable experience.