Park near the Trinquet in the centre of the village of Larrau. A small square below, behind the sports hall, has space for a few cars.
(S/E) Set off from the fountain in the centre of the square. A sign points towards Col Erroimendi. Head between two houses (south-west). Follow this well-marked path, which climbs steeply. Turn left at thefirst fork. The path then opens out and continues to climb due south.
(1) You’ll come to your first track, which you cross. Head into the forest heading south-west, following numerous hairpin bends and turning right at the fork.
(2) Join a wide track and turn right (due west).
Very soon, a path branches off to your left, climbing once more through the heart of the forest, heading due west. Numerous hairpin bends through the forest, heading due west, lead you to a clearing.
(3) You arrive at the restored Chapel of Saint Joseph. The path becomes a track through the forest, heading due west. You reach another clearing with high-altitude summer pastures. The track then heads due south.
(4) Soon, a scrap-metal cross (the Erroymendi Cross) appears on your left.
(5) Very soon we come across another, wider track. Turn right, heading due south-west. The pass is in sight.
(6) You’ll reach the Col d’Erroymendi (1,361 m). Now’s the time to enjoy a snack from your rucksack. The return journey follows the same route in the opposite direction (otherwise, take the road to Larrau).
From this pass, in good weather, you can continue on to the Pic d’Orhy (2,017 m) by following sheep tracks (south-west).