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Coming from Bayonne, head towards Cambo on the D 932, then continue on this road, which becomes the D 918 towards Saint-Jean-Pied-de-Port. On leaving Osses, take the D 948 towards Saint-Étienne-de-Baïgorry. Pass the main square and park 100 m further on in the small school car park.
(S/E) Return to the main road, taking care as there are no pavements. Continue to the left and cross the Nive des Aldudes, then immediately turn left onto a small road. This leads to a tunnel.
(1) Go through it and immediately turn right. Follow the signs. From here, follow the red and white markings ofthe GR® 10 to the foot of Oilarandoi. Follow this road until you reach a small road on the right.
(2) Leave the main road and turn right. The slope becomes steeper; pass to the left of a reservoir. A little further on, the road becomes a path that continues to climb up to an antenna.
(3) Just after the crossroads, turn left. The track continues to climb steeply and leads to a road.
(4) On the right, you can see the path you will take on the way back (Oilarandoi direct). Continue along the road on the right and follow it for about 200 m.
(5) Leave the road and take the path that climbs opposite. Pass to the right of a restored barn. A few metres further on, there is another junction
(6) Continue straight ahead. The slope begins to level out. The path arrives at a crossroads.
(7) Continue on theGR®10on the right. It follows a contour line around Oilarandoi. This path, which is sometimes narrow, overlooks a ravine on the left with magnificent views and arrives at the Ahartzako pass.
(8) Leave theGR®10 and climb to the right, heading north to the summit of Oilarandoi.
The path is well marked. After a steep climb of about 200 m, you will reach the ridge.
The chapel and the summit are slightly to the left.
Magnificent viewpoint and, as is often the case, a 360-degree view.
(9) Retrace your steps to the previous crossroads. (8)
(8) Then take the road on the right and follow it for 1.5 km until you reach a path on the left.
(10) An electric fence has recently been installed. Open it and take this path, which is more pleasant than the road.
Note: for those who are unsure, the road leads to the same place.
This path winds through hedgerows and returns to the uphill path
(4) From there, retrace your steps along the path you took on the way up to (S/E).
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Difficult 
