The Trail des Calès takes place in Millau, Aveyron, in France's Occitanie region, with its next events scheduled for mid-April. It offers two trail running options: a 9 km race, categorized as 10K, and a 15 km race, categorized as 20K. A 9 km walk is also available, ensuring the day accommodates more than just competitive runners.
The courses traverse natural, protected areas within the Parc Naturel Régional des Grands Causses, the limestone plateau landscape surrounding Millau. The 15 km trail is the most attended choice. The shorter trail and walk allow participation for those seeking a less demanding outing on the same terrain. The event appeals to trail runners, featuring a welcoming local ambiance and the motto “Il ne faudra pas caler !”, which translates to "You had better not stall!"