The Tour du lac de Montbel - Léran is a 16 km trail run and walk encircling Lac de Montbel in Ariège, within the Occitanie region of southern France. It typically takes place in mid-October and is untimed, making it suitable for those seeking a sporty outing rather than a competitive race against the clock.
The course traces a path near the lake's edge, featuring technical stretches and clear views of the Tabe massif across the water. Departures can be arranged from various points around the lake, such as the Léran leisure area known as la Régate, the Montbel leisure area in Montbel village, Les Bayards, and the dam by the hydroelectric facility. Participants share the natural environment, with the route defined by lakeside trails, grassy banks, and varied terrain.