Park in the car park at the Roussivau Forest House.
(S/E) Take the tarmac road eastwards, alongside the Roussivau Forest House. Approach the Ruisseau du Perthus before reaching a picnic area.
(1) Begin a gentle climb towards the Perthus bridge by taking the path on the left.
At the first fork, keep to the right and at the next one, keep to the left to follow the Ravin du Perthus.
After passing above the bridge, turn left to begin the ascent. At the top, take a left-hand bend and reach the junction with the track leading to the peak.
(2) Take the track on the left to reach the Pic du Perthus Occidental, which offers a remarkable view.
(3) Return via the same route to the previous junction.
(2) Continue straight ahead on the track, passing close to two cisterns. Shortly after the second one, you’ll reach the Baisse Andoulette junction.
(4) Leave the track to the left for 50m, then take the path that descends to the left. Further down, after a right-hand hairpin bend, you’ll reach a fork in the paths.
(5) Turn right and you will soon come to a track: this is the Castelli track. Turn left onto it. Cross the stream via a bridge and return to the Roussivau Forest House (S/E).