Cross the border at Béhobie and take the N121A towards Pamplona (Iruña in Basque). Take the Oronoz-Mugairi exit, then follow the signs for Bertiz. Park in the large car park at the entrance to Bertiz Park.
(S/E) Head north-west to the entrance to the Nature Park.
(1) Take the path branching off to the right alongside the botanical garden. Ignore a path branching off to the left and continue until you reach the reconstruction of the charcoal-burning site on the left.
(2) Retrace your steps and continue north-east along the wide path. Ignore a turn-off to the right and carry on until you cross the bridge over the Suspiro stream (Susoiroko erreka in Basque) to reach a path turning off to the right.
(3) Turn right towards the north onto the path that follows the contour lines and the stream. The turning point has been chosen arbitrarily to make for an eight-kilometre walk.
(4) Follow the path back in the opposite direction to the park entrance.
(1) Continue south-west, walking alongside the buildings, until you reach the park’s exit gate leading to the Roman bridge.
(5) Retrace your steps along the path to return to the car park (S/E).