To get to the starting point, take the D4 from Urrugne towards Ascain.
Turn right towards the Mendi Azpian campsite, but do not go to the campsite. Continue along this road to the starting point, where there are six or seven parking spaces on the side of the road opposite a block of houses.
(S/E) Go through the cattle grid and take the track that climbs southwards. The track winds its way to a fork in the road where you can see the lake and its dam.
(1) Continue straight ahead towards the south-east until you reach the next crossroads.
(2) Turn right onto the path that descends towards the lake and follow this path along the shore to the western end of the lake.
(3) Leave the wide track on the right and continue along the lake shore.
(4) Ignore the paths that descend to the shore and towards the dam and continue north.
(5) Take the path on the right that runs alongside the Arrola Stream (Arrolako Erreka in Basque).
(6) Turn right as you approach the buildings to return to the car park (S/E).