In Baïgorri, go to the church and take the road to Col d'Ispeguy. Cross the bridge and immediately leave this road to take a small road on the left. Follow it for 1.4 km and park between Xekaleenea and Legasenea in a left-hand bend at an altitude of 260 m.
(S/E) Just after the bend, a small path climbs south-west to reach the base of the Trempetta ridge. The climb is quite steep. Continue to a small summit at 450 m
(1) Continue climbing and the slope becomes gentler until you reach the rocks at 570 m
(2) The climb ends with a bit of easy scrambling. You can avoid this by taking a path on the right-hand side. This path, which is very much like a balcony, is narrow and, although it is well marked, may be vertiginous for some people. You will arrive at an elevation of 809 metres, the summit of Trempetta.
(3) Now head south-southwest. You will pass close to a road, then climb west towards the first intermediate summit of Urrizpilota
(4) Descend, cross the road you passed earlier and head south-west to the next summit of Elhorriko Kaskoa.
(5) From the summit, follow a west-northwest path to a junction of several trails.
(6) At the junction, turn completely left. Take a grassy path and join a road at boundary marker 101 at the Elhorrieta Pass.
(7) At the pass, leave this road immediately and climb up through the trees to reach the forest. Follow the red and white GR® markings. At times, it follows a fence that marks the border. It leaves the forest and then re-enters it. It finally emerges in a meadow. On the left is the Harrigorri rock spur (climbing).
(8) In the meadow, head towards the large rocks and follow the red and white markings that branch off to the left. From the rocks, it is possible to climb directly to the summit by heading off to the right off the trail. This is quite a difficult climb. It is much easier to follow the GR® markings to the north-west ridge of Hautza.
(9) Leave the GR® and climb the ridge north-west to the summit.
(10) Descend by the same route to the Col d'Elhorrieta.
(7) Opposite, take a path through the grass that follows the contour line, making a circular north-east then north turn to an enclosure.
(11) Follow a grassy path northeast that runs along the forest on the left and then enters it. Follow it to the Col d'Ispeguy. Some sections are sloped and can be slippery in wet weather.
(12) Walk along the car park to its end. Take a flat path, turning right before an enclosure. The path continues downhill, steeply, towards the east. It then enters a forest, winding downhill to the Bidegainea farm.
(13) From the farm, follow the road back to the starting point (S/E).
