Park in the site car park (if your vehicle has low ground clearance, it is best to park just after the bridge on the left, near elevation 539, and walk up the track).
(S/E) Head towards the old guardhouse, then turn right to reach the Fours Verriers site, which has been beautifully restored but is fenced off to prevent damage.
(1) Retrace your steps and turn right. At the next junction, keep left then quickly turn right to climb up towards the cliff and its superb views of the Pyrenees (Roc Blanc and Tarbézou) and a bird's eye view of the site you have just visited. Reach the first viewpoint.
(2) Continue to the other secure viewpoint.
(3) Resume the hike. Turn left at the fork to join a track. Turn left again, then right about 50 metres further on, towards the Trou de la Relhe site (descent developed by the association).
(4) Return to the track and turn right for about 200 metres. Then turn left to reach the Ecomuseum and the salt fountain. You can taste the water at the source and even collect some to take home, where you can evaporate it and become a smuggler. But watch out for the customs officers!
(5) Continue straight ahead, then turn right at the fork to return to the car park where you started (S/E).