[A CONFIRMER] Trail'Oween des Clayes-sous-Bois - 10 km MN 2026

Trail'Oween des Clayes-sous-Bois is a late-October forest race held in Les Clayes-sous-Bois, located in the Yvelines area of Île-de-France. The event offers participants a choice between a 10 km trail run or a 20 km trail run, and a 10 km Nordic walking option for walkers. The structure is based on different off-road distance options rather than a single race. Each event consists of a single loop through the forest. The 10 km trail is the most popular choice, featuring 240 m of elevation gain and over 300 runners in the last edition. The 20 km route is more challenging, with 500 m of climbing and over 100 finishers in the past.