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Follow the D4 road to the hamlet of Eylie. Turn right towards Eylie d’en Bas, cross the Ruisseau de Rouge once, and park by the second bridge over the stream, just before Eylie d’en Haut.
The walk is well signposted, with a sign at the car park showing the route. Follow theGR®10andGRP® Tour du Biros markings, then the yellow markings for the circular return leg. Directional signs are placed along the route.
(S/E) From the car park, take the path alongside the stream, heading west, next to the large information board explaining the route. Turn left to cross the stream, then immediately right onto theGR®10, heading west, up a steep climb. Ignore all the small paths you come across along the way and stay on theGR®10to reach the Col de Catauère through the forest.
(1) Continue on theGR®10(andGRP® Tour du Biros) heading west to reach, through the mountain pastures, the ruins of the Anciennes Mines de Bentaillou.
(2) Water point (tapped spring) after passing the cavers’ hut on your left. Cross the Coume Longue stream and arrive at the Narbonne Station at a fork in the path.
(3) Leave the GRT51, which is also marked in white and red, heading south into Spain. Turn right (west) to stay on theGR®10just after passing a large gravelly stream (you can’t miss it!). Pass a commemorative stele. Climb very steeply along theGR®10and, after a final steep section, veering to the right, reach a sort of pass (elevation 2222).
(4) At the Col de Serre d’Araing, leave theGR®10and head straight ahead, climbing the ridge path to reach the Pic de l’Har. The few yellow markings may help. Caution: There are three rocky ledges along the route which can easily be bypassed via the eastern slope on the ascent to the Pic de l’Har (elevation 2422).
(5) Turn back and return to the Col de Serre d’Araing (remember to bypass the rocky ledges via the east).
(4) Turn right to stay on theGR®10(and theGRP®) heading towards the Étang d’Araing and its dam. The Étang d’Araing mountain refuge is 10 minutes away via theGR®10, should you need it.
(6) Leave theGR®10. Head down to the right, towards the north, to join theGRP® Tour du Biros (yellow and red markings).
(7) Turn left towards the Cabane d’Illau to stay on the GRP®. Pass by the Fontaine d’Illau and enter the forest.
(8) Leave theGRP®. Turn right, heading due east. From here, follow the yellow markings. Head towards the Col des Cos. Leave the forest shortly before the pass.
(9) From the pass, head down towards the Cabanes des Clos (one for the shepherd, one for walkers).
(10) Ignore the paths branching off to the right and the one running along the mountainside. Descend via a faint path heading south-east, keeping to the right of the fence at all times (do not cross it). The yellow markings are often on the other side of the fence (sometimes 3 metres further on), but you must never cross it (always stay to the right of the fence) or you risk getting lost in another valley! The path heads south-east, then south, then west again and south once more, eventually reaching the Haurendech stream, which can sometimes be difficult to cross.
(11) Be careful, this fork in the path can be tricky. There are two yellow markings here, one on the right (the old route) and one on the left. After crossing the stream, take the path that climbs slightly (at the start) on the right to stay on the hillside through the forest. Make sure you follow the markings.
After a bend to the right and a descent along a wider path, you’ll reach a 90° bend to the right.
(12) At the Eylie megalith, turn right to reach the final bend leading to Eylie d’en Haut. At the bend, head down to the left along the small road towards the car park (S/E).
Visorando Member
Moderate 
Very difficult 
