The 35 km Trail du Lac d'Oô is a mountain trail race held in Oô, Haute-Garonne, in the central Pyrenees. It begins at 07:15 with 2,300 meters of elevation gain over 35 km, presenting a demanding challenge rather than a casual lakeside run. Shorter race distances are also available: 7 km, 14 km, and 24 km.
The course crosses mountain trails and forest paths within the Pyrénées Haut-Garonnaises, located approximately 1 hour 30 minutes from Toulouse via the A64. The 14 km race, named La Lac d'Oô, features 575 meters of climb and descent. The 24 km La Larboustoise offers 1,400 meters of elevation change and can be completed individually or as a relay. Registration is managed via chrono-start.com.