Test your speed and endurance on the nearly flat trails of Parc du Peuple de l'Herbe with Carrières-sous-Poissy’s 6km and 12km races. Designed for both seasoned athletes and newcomers, these races are a key part of the Yvelines Challenge. Push your limits alongside fellow competitors in a professionally organised event, held with support from FLEP and the Grand Paris Seine & Oise urban community.