Start: From Irun, head for the Aiako Harria Nature Park; the road winds up to the pass, with parking along the road that descends after the pass.
(S/E) Go down to the bottom of the car park and take the path heading due West into the forest on the right.
(1) Turn left. Leave the first upward path on the left and take the second downward path opposite. Follow the PR® GI 1012 path to the right, winding its way to a stream, which must not be crossed.
(2) Take the left-hand path opposite, which leads to a bridge. Cross the stream and follow the path opposite to the old Meazuri mine and ruined houses.
(3) Continue to the left over the water catchment workings: the crevasses on either side of this structure are where the ore was extracted.
(4) Then retrace your steps to the ruined houses.
(3) Turn left along the stream.
(5) Ford the stream and immediately fork left onto the path that passes through Meazuriko tunelak (Meazuri tunnels in Basque). Don't forget to admire the waterfall on the left between the tunnels, which is clearly visible between the last two tunnels. Further on, turn right (East) and you'll soon come to a path junction.
(6) Take the yellow-signposted path to the right towards Erlaitz, and at the next junction, turn right onto the path leading up from PR® GI 1012.
(1) Rejoin the PR® GI 1012 and continue straight on, slightly to the left to follow the opposite route to the parking lot (S/E).