The start of the hike is at the Eyrheralde car park, near the recycling centre (in the commune of Saint-Étienne-de-BaÏgorry).
(S/E) Follow Suhilarreko Bidea towards Saint-Étienne-de-BaÏgorry. Take the first road on the right, for 200 m.
(1) Leave the road and take the path on the right, which winds uphill to a hut.
(2) Follow the path climbing north-north-west. Pass a hunters’ post and reach a track.
(3) Turn left onto it and follow it to the end.
(4) Follow the ridge line to Larrango, at elevation 582.
(5) Descend to the pass and the renovated hut below.
(6) Follow the path, which is sometimes stony, sometimes grassy, passing to the left of the hut and beginning to climb northwards. You will reach another renovated hut.
(7) Continue to the right until you reach a path on the right at the 638m mark.
(8) Take this path and continue to the summit of Larla.
(9) Descend north-east and follow the ridge.
(10) Continue straight on, reaching the right-hand side of some rock cavities. Continue descending, keeping as close as possible to the rocky ridge on the right. The path is not clearly marked and requires you to weave your way between the rocks. Join a paved path below.
(11) Follow this path to the right; it becomes grassy and initially runs alongside some cavities, then, after a wide circular loop, veers eastwards and passes to the left of a ruin.
(12) The path descends and heads north. The track is very well marked and passes to the right of a chasm before joining a concrete track.
(13) Turn right onto this track and, at the next bend, take a path on the right which descends and joins a small track, which you also take to the right. Pass close to caves from which iron ore was once extracted. The path widens and becomes a track: this is the Iron Discovery Trail. Follow it to a sort of enclosure, open on both sides, at the 500-metre mark.
(14) Leave the main path, which continues straight ahead, and take a track to the right through the ferns. This track leads back to the renovated hut you passed on the way out.
(6) Follow the newly resurfaced track to the left until the next junction.
(15) Go straight on. At the fork, at elevation 486, ignore a path on your left and go straight on to rejoin the track at a fork you passed on the way out.
(3) Turn left and follow the ascent route in the opposite direction to return to (S/E).