Park in the car park on the towpath, between the municipal technical centre and the Ustarritz pumping station.
(S/E) Take the towpath heading north-east. Stay on this path to reach Notre-Dame de la Nive.
(1) Make a U-turn in front of Notre-Dame, after crossing a footbridge. Return to the towpath. Reach a footbridge over the Nive after the hamlet of Portuberria.
(2) Take a moment to walk back and forth across the footbridge to admire the view.
Then continue northwards to the next circular loop.
(3) Turn around and return along the same route to the car park (S/E).