From the A64 motorway, take exit 20 (Saint-Girons) and head towards Castelbiague via Salies-du-Salat/Mane, then follow the D13 to Castelbiague.
Park at the entrance to the village, near Castelbiague church.
(S/E) Head to the village centre, then continue along the D13 towards La Ribereuille/Arbas. At the hamlet of Pau, turn left to quickly reach the junction with the Chemin du Moulin.
(1) Turn left onto this track, cross the River Arbas, then go round a hairpin bend. After the hamlet of Fesons, you’ll come to a Y-junction.
(2) Turn right onto the Chemin des Petits Bérets, marked with yellow signposts. Carry on, then rejoin the Ruisseau de l’Arbas and follow it to reach La Ribereuille.
(3) Turn left onto the Chemin du Chanchou, which very quickly becomes a forest track. Climb steadily through a dense forest. When the slope levels out, look out for the ruins of a small stone house.
(4). Leave these on your left to join a clear, stony track leading up to the Col de Noustens.
(5) Turn right and follow this easy path, which leads to a fork in a vast, rocky clearing.
(6) Take the path on the right which follows the contour line. Leave the woodland temporarily before returning to it at some old charcoal kilns. Follow the path as it re-enters the woodland and joins the Route d’Heregade.
(7) Follow the sign for ‘Mont Aragnoué – mountain bike route’ to the right to reach the summit.
(8) Return to the previous junction.
(7) Turn right onto the Route d’Heregade until you reach a junction of paths and tracks at the Col d’Arbas.
(9) Turn left onto a small path marked in yellow which winds through pastures. At the fork, continue left and you’ll reach a junction with a drinking trough on the left.
(10) Turn left onto the ascending path marked in yellow. You will soon reach the wide stony path and the rocky clearing you passed on the way out.
(6) Head down this forest track to the right to return to the Col de Noustens crossroads.
(5) Keep to the right on the track suitable for vehicles; after a long circular right-hand bend, you’ll reach a crossroads. Head far to the right for 150 m.
(11) Continue to the right, still on the track, then, after a hairpin bend to the left, you’ll reach a junction at a place called Les Gaouats, with its fountain.
(12) Carry on straight ahead, then turn right onto Chemin du Moulin. Follow the Rieuouaris on your right until you finally reach the Arbas and the Castelbiague cemetery at a T-junction.
(13) Turn left and carefully follow the departmental road to reach the centre of the village of Castelbiague, the church and the car park (S/E).