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This region is home to numerous sinkholes, where flowing surface water from streams disappears into cracks in the chalky subsoil, emerging much lower down in the landscape. The most famous is the Chantoir in Olne. The Ry de Vaux stream disappears into the subsoil here, flowing through an underground cave system and reservoir. It is fed by other surrounding water and re-emerges in several karst springs in Vaux-sous-Olne, 760 meters further and 60 meters lower!

Also called Château Chrouet, after Dr. Warnier Chrouet, who had it built around 1700. Its facade was kept simple. At the rear, large windows overlooked the green Vesdre valley from the hill. A striking feature of the facade is the 17th-century entrance portal in carved limestone with a canopy (canopy) above it. This was typical of many buildings of that period in Olne and was locally called a "teutê." We also see some on the cemetery portal and the municipal garden, but most have been lost over time. The castle's teutë was embellished with a charming turret.

The Olne sinkhole, where the Ry de Vaux stream plunges into the subsurface, emerging 60 meters lower in Vaux, at various points, and then reemerging nine days later. It flows through an underground cave system, flowing through other water bodies and a reservoir.

is currently dry, unfortunately

Climbing steeply to the rocks...

Steep climb to the rock along the cave niche Trou des Sottais. On top of the rock some remains of the ruins of the Site de la Chantoire

This cave is located on the left bank of the Ruisseau de Villers (La Pancherelle) and is located a little higher up along the hiking trail, in the forests of Saint-Jacques. The "nuton" (or lûton, nûton, gnome in Dutch) is a small creature from the folklore and popular beliefs of the French and Belgian Ardennes. The nuton has the same origins as the gnome, but according to local folklore, caves, caverns and underground passages make up most of its habitat, much like the dwarves of the Germanic world.

The water of the 'Ry de Vaux', which disappears into a sinkhole here in the Rue Falise and flows underground, takes about 9 days to return to the surface in Vaux-sous-Olne via several karst springs. The long duration of the subterranean stay indicates a large underground water reservoir. See also https://www.komoot.com/nl-nl/tour/1709651316/annotate/highlights