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Parking is available on Rue du Viaduc near the school.
(S/E) Head towards the bend, take the tunnel on your left and pass under the railway. The pedestrian crossing is very high because the tunnel may be flooded at certain times. The measuring rod at the entrance to the tunnel proves this. Move from the urban environment to the natural environment.
At the tunnel exit, on your right, you can take a fairly steep path to discover the Dieu-le-Père cave. To do so, keep to the right as you climb. Traces of human occupation dating back to the Neolithic period have been found here, but unfortunately, more modern debris is now visible. Take the path to the left of the cave and descend carefully.
Yellow rectangle markings
Once back on the road, turn right. Walk past the houses and ignore the path on your right.
At the fork in the Fond des Vaulx stream, turn right. At the sign, take the footbridge on the left and then turn right. Walk past the barbecue area, which is located on higher ground. Continue along the path, paying attention to a trail on your left leading to an unnamed cave.
(1) At the fork, continue to the right. At the fitness trail equipment and the information sign for the Fond des Vaulx nature reserve, go down the embankment on the right to see the Sourd'Aiwe resurgence. Go back up the same path and continue to the right. At the corner of the fence, you will see signs of erosion on the ground, revealing the entrance to a small cave. Walk along the fence, noting the bare rock outcrops of the reserve, to return to the chalk grasslands.
(2) At the end of the fence and before the forest house, turn left and go up the path. Along the way, discover the Ducasse cave. At the top, turn right. At the crossroads, with a view of the canopy on your right, continue straight ahead. Pass in front of "La Cheminée", a vertical hole also known as "Trou du Renard" (Fox Hole), which is surrounded by barriers for everyone's safety. Continue and you will see a sinkhole on your left. Continue to the Trotti aux fosses chasm, which is also surrounded by barriers for everyone's safety. Walk around it to get a good view of the collapse. Return to the path and continue.
(3) At the forest path, turn right. Leave the marked trail.
(4) 70 metres further on, atthe first path on your right (not shown on the map), turn and descend. At the bottom, turn right. At the path on your left (not shown on the map), before the fitness trail equipment, turn.
GR® markings
At the forest path, turn left and climb up to the crossroads. Markings end here.
No markings
At the crossroads, continue straight ahead for 250 m to discover the Chantoirs Pierard. Retrace your steps and at the crossroads take the forest path opposite.
GR® markings
Ignore the paths on the left and right. Pass the footbridge again, then the houses you saw on the way there. Take the tunnel under the railway line again and return to your car park (S/E).
Visorando Member
Moderate 
