The start is on Rue de l'Allée on the outskirts of Saint-Hernin, on a grassy square.
(S/E) Head towards the village centre and, opposite the wash house, turn left. Turn left again a few metres further on, into Rue Goasnou. Leave the village and, after crossing a stream at the edge of a large estate, look out for a signposted path leading down to your left.
(1) Follow this path which runs along the edge of the property, and head down into the forest, quickly heading north-west. At the first junction of paths, turn left towards the stream. Cross it and turn right. Follow the bank and soon turn left, climbing slightly and following the course of another stream. Follow this path until you reach a tarmac road, Rue de l’Allée (or de Bel Air).
(2) Turn right, ignore the first road leading towards the hamlet and, at the next junction, take the road on the right which enters the undergrowth. Continue downhill, ignoring the various trail junctions you come across. You will reach the end of the trail at the edge of the Route de Bourbriac, D8.
(3) Do not join the main road, but head for the side road on your left, Rue du Moulin à Fouler. Further on, at the first junction, at elevation 105, turn right and continue. Pass the junction with a dirt track at the 122 mark (great view of Guingamp), then the one at the 118 mark. Shortly afterwards, you’ll come to a left-hand bend and a junction before Kerlidiguez.
(4) Leave the main road by turning right onto this track which winds down between fields and woodland. After a right-hand bend, at the end of the pasture, the track becomes a narrow path leading down to the banks of the Trieux. Along the riverbank, head left and, as you leave the pine forest, turn left, following the edge of the meadow. Climb up to reach the village, and arrive at a double junction. Ignore the first one and the road leading off to the left. Arrive at the second junction.
(5) Take the Route de Kerlosquer on the right, pass the access road to the mill, and reach a bend at the entrance to the hamlet.
(6) Look out for the path leading off to the right through the vegetation, towards the Kerlosquer Viaduct. Walk there and back to this relic of the past.
(7) Return to the road, then turn right, leave the hamlet, and go straight on at the first junction. You will reach a crossroads at the 126m mark.
(8) Head left, continuing along the main road. You will then reach the village of Saint-Hernin, ignoring the side roads, and arrive at the wash house. Enjoy the site, then turn left onto Rue de l'Allée and return to your car park (S/E).