Park in the square by the village hall in Saint-Michel-sur-Ternoise.
(S/E) From the square, head for the D8 county road, turn right towards the south-east and follow it for about 500 metres.
(1) At the first junction, turn left onto Rue d’en Haut heading east, follow it for about 500 m and, at the crossroads, turn left heading north-east onto Chemin de Rocourt.
(2) At the junction with a path on the left, take it north-west towards the woods; at the edge of the woods, turn left, follow the path for 50 m and enter the woods at the second entrance – the first being private. Follow the path straight on, heading west-south-west, until you reach the source of the Ternoise.
(3) Turn right towards the restaurant Les Catherinettes and join the D85E3. Turn right and, after 20 metres, take the woodland track on the right heading north-east. At the end of the track, turn left onto the road and enter Grandcamp.
(4) At the junction by the water tower, cross the D85E3 and follow the road opposite, which ends in a forest track. Follow it all the way down.
(5) At the wayside shrine, turn right heading north-north-east, walk alongside the cemetery and continue along the forest track.
(6) At the crossroads of tracks near the railway line, turn right, go under the D 941 and join the D 86.
(7) On the D86, turn left, cross the railway line, pass under the D941 again and, after 1,000 metres, walk alongside the Ternois waste disposal site.
(8) At the entrance to the industrial estate, turn left at the first junction and continue to the sewage treatment works. Turn left, then left again, and walk past a concrete mixing plant.
(9) At the end of the stony track, turn right onto the path leading down towards the woods. At the pumping station, follow the path on the left and head towards the tunnel on the right.
(10) Go through the tunnel; make sure you have a torch, and follow the path which climbs back up through the woods.
(6) When you reach the forest track, turn right onto the path you took on the way there.
(5) At the crossroads, take the second path on the left heading south-east.
(11) At the junction with the D 85E3, turn right and join the D 8 to return to the starting point (S/E).