La Sillandaise is a nature race in Chavagne, organized by the Courir à Chavagne association. Runners choose between three formats: La petite Sillandaise, an 8 km individual race; La Sillandaise, a 16 km individual race; and Le relais de la Sillandaise, a two-person relay where each runner covers 8 km. All races share one morning start at 9:30 AM.
The start is at Salle Saint-Éxupéry, beside the football pitches and athletics track, making the event easy to locate for runners and supporters. Bib pickup opens on race morning from 8:00 AM, registration is handled through Klikego.com, and every participant receives a prize. The relay option provides a team format alongside the solo races, suiting runners who want a short nature run and those looking for a longer outing.