From Oiartzun, after a long winding road up in the direction of Lesaka (GI-3420), the vehicle may be parked on the roadside before the tunnel (height 502 m).
A pebbled track goes up on the right hand until a field and a hut on the pass.
The trail heads north to the summits past a plantation of small trees in memory of dead Basque nationalist activists and militants.
The trail opens its way out of grass patches and crooked passages, with clear signs all along.
No climbing needed, although crawling is needed in order to overcome some obstacles.
At one point, a tricky stretch must be passed where a ring must be grabbed in order to continue.
After reaching the last summit of Irumugarrieta, the landscape turns opener.
Breathtaking scenery of the whole Basque coastline, Landes, Basque mountains and the western Pyrenees.

Keep north-bound in a steep descent leaving behind the Juncal cave on the right (748 m high).
The trail falls past the remains of a military defence line dating from the Civil War till an open larch forest is reached, and on to the pass of Elurretxe (road).
This is the access called Castillo del Inglés too, after a building nearby nowadays in ruin.
For the way back, in order to skip the same trail to return, the PR-GI 20 looping around the massif can be taken, either through the western side or the eastern one.
In the first option, the trail runs back south at middle height through forest landscape most of the time, except for the final stage, before merging with the starting point in Aritxulegi.
No slopes up at the beginning, but several twists and zigzags up on the way.
From Oiartzun, after a long winding road up in the direction of Lesaka (GI-3420), the vehicle may be parked on the roadside before the tunnel (height 502 m). A pebbled track goes up on the right hand until a field and a hut on the pass. The trail heads north to the summits past a plantation of small trees in memory of dead Basque nationalist activists and militants. The trail opens its way out of grass patches and crooked passages, with clear signs all along. No climbing needed, although crawling is needed in order to overcome some obstacles. At one point, a tricky stretch must be passed where a ring must be grabbed in order to continue. After reaching the last summit of Irumugarrieta, the landscape turns opener. Breathtaking scenery of the whole Basque coastline, Landes, Basque mountains and the western Pyrenees.
Keep north-bound in a steep descent leaving behind the Juncal cave on the right (748 m high). The trail falls past the remains of a military defence line dating from the Civil War till an open larch forest is reached, and on to the pass of Elurretxe (road). This is the access called Castillo del Inglés too, after a building nearby nowadays in ruin. For the way back, in order to skip the same trail to return, the PR-GI 20 looping around the massif can be taken, either through the western side or the eastern one. In the first option, the trail runs back south at middle height through forest landscape most of the time, except for the final stage, before merging with the starting point in Aritxulegi. No slopes up at the beginning, but several twists and zigzags up on the way.
Peñas de Aya