The triathlon of Lake Malsaucy, the flagship event of Belfort's sporting season
The Belfort Triathlon, organized under the name Triathlon du Lion, brings together more than 1,400 triathletes each spring on the shores of Lake Malsaucy in Sermamagny. Lake swimming, cycling in the Southern Vosges, and 100% nature running: four formats — L, M, S, and kids — welcome experienced athletes and beginners in an exceptional natural setting.
Born from the revival of the Belfort triathlon, the Triathlon du Lion quickly established itself as one of the unmissable sporting events in the Territoire de Belfort. Organized at the Lake Malsaucy site in Sermamagny (90850), just a few kilometers from Belfort, the event attracts more than 1,400 triathletes each spring from France and neighboring countries (Switzerland, Germany, Luxembourg).
Lake Malsaucy is the natural jewel of the Territoire de Belfort. This body of water, nestled in greenery in the heart of the Southern Vosges, offers an ideal setting for triathlon: calm, clear waters for swimming, forest roads and trails for cycling in the Southern Vosges landscapes, and natural paths around the lake for running. The Malsaucy peninsula is the nerve center of the event, with the transition areas, the exhibitor village, and the podium.
The Triathlon du Lion offers a complete range of formats:
Duo Mixte, Relay (2-3 people), and Aquathlon with joëlettes (inclusive triathlon) formats complete the offering to make the event accessible to everyone.
The success of the Triathlon du Lion relies on the commitment of over 200 volunteers mobilized on the day of the event. Safety, refreshments, signage, reception, and entertainment are provided by this network of enthusiasts. The organization also guarantees a quality experience for spectators: viewpoints along the course, entertainment in the village, and a trophy award ceremony.
The Triathlon du Lion perpetuates and renews a long tradition of triathlon in Belfort. After a period of interruption, it has been revamped with a redesigned format and professional organization, while retaining the friendly spirit and the beauty of the natural Malsaucy site that made Belfort events famous.
The 2nd edition of the Triathlon du Lion will be held on May 23 and 24, 2026, at Lake Malsaucy in Sermamagny. The four formats (L, M, S, Kids) will once again welcome triathletes from France and neighboring countries in an exceptional natural setting.
The 2nd edition of the Triathlon du Lion is scheduled for May 23 and 24, 2026, at Lake Malsaucy in Sermamagny. Building on the success of the inaugural edition, the organizers promise an even more festive and sporting event, with the usual four formats: Race L (La Gueule du Fauve), Race M (La Rugissante), Race S (La Coup de Patte), and Kids Races. Registration will open in the spring on the SporKrono platform.
Lake Malsaucy — Malsaucy Peninsula, 90850 Sermamagny.
By car: Sermamagny is 8 km southeast of Belfort, accessible via the D19. Parking near the site (carpooling recommended). By public transport: Optymo bus from Belfort center.
Online registration on the SporKrono platform. Registration opens in the spring.
Prices vary by distance. Race S from €30, Race M around €50, Race L around €80. Kids Races are accessible.
Triathlon du Lion — triathlondulion.com
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Lac du Malsaucy — Péninsule de Malsaucy, Sermamagny
Péninsule de Malsaucy, 90850 Sermamagny