In Urdax, park at the car park at the end of the square.
(S/E) From the village square, cross the small bridge and turn right. Climb a fairly steep, wide cement path to a gatehouse.
(1) Take a partially gravel dirt track that climbs to the right. The path passes through a grassy area with an unobstructed view.
(2) Continue climbing in a series of hairpin bends. After a few minutes, it joins a wide horizontal path.
(3) Take it on the left (yellow mark).
(4) At the junction at the top of this path, take the path opposite that climbs upwards (yellow mark). Further up, it joins a wide horizontal path.
(5) Take it on the right and then immediately turn left onto a path that climbs steeply.
(6) Go through the fence near the first picnic area (table, benches, barbecue, water).
Continue and, at the crossroads, take the path opposite, which is sometimes thorny and overlooks the road (N121B). After a small clearing, you will arrive at a second picnic area with tables, benches, numerous barbecues, water points, toilets and car park. We are about a 2-hour walk from the start.
(7) At the end of the car park, take the small road on the right that goes uphill (marked green/white).
(8) At the top, after the parking spaces, turn left onto the path that starts off horizontally before climbing and joining a track. Continue right on this track, passing a turn-off on the right and arriving at the "Baztan" sign.
(9) Continue a few metres past the sign and cut across the grassy track opposite, which avoids a tedious detour. Alkuruntz towers above us on the right at 933m. Join the track and take it to the left.
(10) At the crossroads, you can enter the campo de tiro (shooting range) and 20 metres away you will find a beautiful hunters' hut (tables, benches, shelter, barbecue and water point... access is permitted but you must leave the place clean).
Return to the track and turn right at the first bend towards Alkuruntz. The path crosses a round enclosure made of stakes. A few metres further on, take the path on the left that climbs up to the pass (15 minutes from the hut).
(11) A few metres further on, take a horizontal path on the right that runs alongside standing stones, crosses rocks and descends steeply to the road/path junction you passed on the way up.
(8) From there, retrace your steps in the opposite direction to the junction.
(4) Do not descend to the right as you did on the way up, but take the green/white marked trail to the left.
(12) At the three-way junction, turn right onto the path that descends to the village (S/E).