The Trail du Pacte des Loups begins and ends in Esparros, a village in the Hautes-Pyrénées department of Occitanie, in southwest France. This mountain trail event, typically held in mid-September, offers several race options instead of a single set distance. The available courses are 11 km, 21 km, and 36 km, with the longest route reaching an elevation of 2,850 meters. This variety accommodates both novice trail runners and those seeking a more demanding challenge in the Baronnies pyrénéennes.
The race crosses the trails of the Baronnies des Pyrénées and the Bassia massif, presenting a challenge that combines distance with steep terrain. Its name is derived from Le Pacte des Loups, a film inspired by the Beast of Gévaudan legend. This connection is significant as the film was shot in the Baronnies, the same region where the race takes place. The event embraces this wolf-and-beast narrative, guiding participants along the "traces of the beast" while maintaining a practical format: short, medium, and long trail routes starting from the same mountain village.