The first part is downhill on a pleasant path between undergrowth and wild pastures. On arrival in the magnificent hamlet of Gourdouze, you continue downhill to Vialas on a path that is open and rocky at first, then runs through the forest.A long ascent on a path with some fairly steep sections brings you to Les Tourrières. At Les Tourrières, you take the road for 1 km before climbing on a pretty path through rocky blockfields and grassy plains to the glorious Tarn bridge. You return to the departure point on a runnable track. 

Follow the waymarks for trail #21.
Signposts will guide you all along this route, as well as yellow painted waymarks. In the description below, the signposted place names and/or directions are given in bold italics between quotation marks:

Starting at "Mas de La Barque", head for "Gourdouze" via :

1. "Les écuries de Mas de La Barque",


2. "Rochers de la barque" (2x),


3. "Les faux des Armes" and


4. "La Chassalde".


5. At "Gourdouze", go downhill to Vialas and go to:


6. « Rompidou »,


7. "Maison de retraite",


8. then « La Vigne ». Go to:


9. “Plagette”,


10. “Lou devez”,


11. “La tranchée”,


12. “Légaou”,


13. "Rieutord" (2x). Head for "Les Tourrières" via :


14. "Les Polimies Hautes".


15. At "Les Tourrières", go to "L'Aubaret" via :


16. "La Boulade" and


17. "Pont de l'Aubaret".


18. At "L'Aubaret", head for 


19. " Gap Francès" and "Pont du Tarn".


20. At "Pont du Tarn", return to "Mas de La Barque" via


21. "Les Nasses du Pont des eaux",


22. "Bois du Commandeur",


23. "Bouos de l'Oultre",


24. "La Planette",


25. "Sénégrières",


26. “Gardièze”,


27. "Martelet" and "Mas de La Barque". 

This trail is taken from the guidebook Mont Lozère - Pays des sources, published by the Pôle de pleine nature du mont Lozère.