20km and 900m positive altitude change**
From the Doubs river source in Mouthe on Sunday, 1st October 2023 to Métabief (department 25 for both of them).
Limited to 900 runners.
Registration fee : 40€ / runner
The registration fee include : the entry to the run, the timing, safety all along the race, the food ans water supplies, the access to the showers or any other facilities rolled out by the organizer.