Le Vallion is a nature race in Saint-Jouan-des-Guérets, organized by Les Défoulés de Saint Jouan. It is a roughly 12 km trail-style loop, with the official course listed at 11.82 km, and it is open to runners born in 2010 or earlier. Entry is priced at 12 euros, plus a 1 euro management fee, with registration handled through Nextrun.fr.
The loop mixes short road sections with off-road running: about 1.3 km is on roads and 0.5 km is on forest tracks. The route climbs 129 meters and drops 126 meters, so it is not flat, but the elevation is spread across a compact local course rather than a mountain route. This is the race’s third edition, and the organizers add a simple community touch after the finish with a tombola offering multiple prizes.