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Start: From the autovia A-21 (Pamplona to Jaca), take exit 35, then head for Lumbier (for those coming from the East, exit 39 also points to Foz de Lumbier, but it only takes you to a viewpoint from which you can admire the fos).
From exit 35, follow the signs for "Foces de Lumbier y Arbaiun", then "Foz de Lumbier". Once you've passed these signs, you'll arrive at the "Fos de Lumbier" car park.
Waymarkers: Signs for the entire hike: White and Green''.
(S/E) Leave the car park toward Foz du Lumbier.
(1) After a couple of hundred metres, when the mountain begins, take a path to the left (a wooden sign reads "sendero local / Herri bidea"). It follows the separation between the plain and the mountain, passes through a gate (don't forget to close it), then turns right and begins the climb.
(2) The path joins a wide, passable track. Follow signs for "Foz du Lumbier". Five hundred metres further on, ignore a track which goes off to the left (there's a ruined house just beyond on the left). Three hundred metres further on, ignore another track which goes off to the right and stay on the track which roughly follows a power line.
(3) The path comes to a T-junction. Turn right (signposted "Foz du Lumbier") and start downhill.
(4) The path comes to another asphalt road. Turn right and continue downhill.
(5) Shortly after an almost 180° bend, take a steep downhill path (still signposted "Foz du Lumbier"). Follow it until you reach a path running alongside the Rio Irati.
(6) This path is the "Camino Aragonés", i.e. one of the Camino de Santiago. Follow it Westwards.
(7) Enter the tunnel, then follow the path into the Foz. At the end of the tunnel, take a second tunnel.
(1) Return to the car park (S/E).
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Difficult 
Very difficult 
