Start from the small car park at the junction of the D1 and the D31.
(S/E) Follow the Route Forestière des Fourmis, which climbs steadily towards the south-south-west.
(1) At the Saint-Hubert junction, keep to the right and continue uphill along the Route Forestière de la Taille aux Loups.
(2) After passing under a power line, stay more or less on the 275m contour line before descending a gentle slope back to the D31.
(3) Drive down this road to the right with care (very narrow verge) for about 1 km to reach the car park (S/E).