[A CONFIRMER] Trail du Pays de Sully - 10 km 2026

The Trail du Pays de Sully 10 km, known as La Sully, is a timed trail race held in Rosny-sur-Seine, Yvelines, each September as part of the Courses du Château de Sully. It begins and ends at the Roland Leduc stadium and is open to participants aged 16 and up. The event also features a 5 km run, a 5 km walk, and children’s races, catering to club runners, novices, walkers, and families, not exclusively seasoned trail runners. The 10 km course crosses the grounds of the Château de Rosny-sur-Seine and the Seine riverbanks, favoring forest trails over paved roads. The château gates are opened specifically for the races, granting access to areas not usually run through. The terrain is characterized as technical, with sufficient unevenness and elevation changes to demand careful footing, yet it avoids becoming a mountain-style challenge. Local associations, businesses, partners, and volunteers contribute to the event, which also raises funds for La Note Rose.