Semi marathon de bullion - Senlisse 2027

The Semi-marathon de Bullion is a 21.097 km half marathon held in the Yvelines department, beginning in the village of Bullion each February. Bullion is located within the Regional Natural Park of the Chevreuse Valley, positioning this as a small-town French half marathon rather than a major city road race. The available race details cover the course, elevation profile, GPX trace, registration, and bib information, aiding runners in planning their pacing and logistics. The event has a past as a solidarity race, adding a community dimension beyond the race distance.