From Argelès-Gazost, take the Val d'Azun road (D918) towards Aubisque until you reach Aucun.
At Aucun, turn right and follow the D918 up to the large car park at the Col de Couraduque.
(S/E) From the car park, head towards the restaurant and, after passing the buildings, you will arrive at the Col de Couraduque crossroads.
(1) Turn 90° to the left and take the track that climbs westwards into the forest.
Follow this track to Col de la Serre.
(2) Turn left onto the track (south-west, sign).
After about 50 metres, stay on the track on the left.
(3) At the fork, stay on the track on the left again and follow it uphill, ignoring the intersections, until you reach Col de Bazès.
(4) Go past the barrier and continue along the track, which descends slightly towards the south, until you reach the Col du Soulor sign on the left-hand side of the bend.
This sign also indicates the direction of Col de Berbeillet.
(5) Leave the track and climb left off-trail through the summer pastures to the south-east until you reach the wide Col de Berbeillet.
Bear towards the nearby summit bastion in a south-southeast direction.
Rejoin the trail at the base of the bastion and then climb to the summit of Pic de Berbeillet, marked by a cairn.
(6) To return, retrace your steps to the Col de Bazès crossroads.
(4) To complete the circular route, turn left onto the track.
The track descends gently and passes close to the Marioulète metal hut, then climbs eastwards to join the Col de la Serre.
(2) From the pass, take the track opposite the crossroads, then follow the outward route in reverse to the car park (S/E).