Robessart, the Gillaru valley, the Nantanru valley

Starting point: Thilay community hall.

(S/E) Opposite the church, turn right into Rue Éva Thomé, then left into Rue de la Motte. At the war memorial, head up Rue de la Roche until you reach Chemin des Éteignières.

(1) Cycle along the Chemin des Éteignières until you reach a crossroads.

(2) Continue along the tarmac road and, 150 metres further on, turn right (GR® red and white markings). At the next two junctions, keep going in the same direction until you reach the Naux footbridge.

(3) Turn left onto the Transsemoysienne, follow the Semoy river, then take the first path to the right to reach the Nohan bridge.

(4) Cross the bridge and head up the embankment to the left, before following a well-marked path which joins the Chemin de Nohan

(5) Turn right until you reach a large junction (Chemin de Gespunsart).

(6) Turn left and climb up to the gas pipeline (you will then be at the top of the Dames de Semoy). Access to a viewpoint via a small path on the left. (The final 100 metres over rocky ground may require you to dismount).

(7) Continue along the gas pipeline to the paragliding launch site, then ignore all paths branching off to the right and head towards a telecoms pylon.
After a steep descent (tarmac), you’ll reach La Hatrelle (signposted).

(8) Leave the mountain bike trail markings and head straight ahead towards the Croix d’Enfer, a lovely viewpoint over the Hautes Rivières.
The path has a few “substantial steps” but presents no other hazards.

(9) Continue in the same direction and, at the next junction, turn left to head down to the Newet neighbourhood. Turn right (Rue du Château d’eau) until you reach the bridge.

(10) Cross the Semoy, turn right and then immediately left onto Rue du Lyri, then right onto Rue du Petit Ohan, until you reach the Ruisseau Saint-Jean.

(11) Take Rue des Paquis on the left and continue to Noiregoutte (signposted).

(12) Continue through the Ruisseau Saint-Jean valley; then, after a left-hand bend, the path climbs into the Gillaru valley. Stay on the main forest track until you reach the old Champ Bernard Forest House.

(13) Take the Route Forestière de la Dauphiné (tarmac) for about 150 metres towards Roc la Tour, then turn left onto a path marked with a GR® signpost, leading to the Liris viewpoint.

(14) Turn back and, 200 metres further on, take a path on the left. At the nearby Fork in the road, turn left again. After a lovely bend, the path leads to the Ruisseau du Nantanru, which you then follow alongside. As you approach the river, keep to the right to follow a path running above the Semoy and the Transsemoysienne. Before a steep climb, keep to the left towards an old quarry track leading to the Moulin de Naux. Head back down to the footbridge. Access to the footbridge has been prohibited since 26 March 2025.

(3) Turn right onto the Transsemoysienne towards Thilay. At the Fork in the road at the entrance to the village, turn left towards the church (S/E).

Shelter, table and benches at Champ Bernard.

A 20-metre stretch where you’ll need to carry your bike after the Pont de Nohan, and a few sections where you’ll need to dismount on the Croix d’Enfer ridge.

Viewpoint at the paragliding site.
Viewpoint at the Croix d’Enfer.
Viewpoint at Le Liris.