Roche aux Corneilles

Roche aux Corneilles is a limestone crag rising about 35 meters above the Ourthe river valley, right next to the village of Bomal, in Belgium's Luxembourg province. Sometimes referred to as Roche Hiernaux, it is one of the landmark rock formations of the Famenne-Ardenne region, where steep stone walls emerge straight out of the surrounding forest.

What is this rock actually made of?

Roche aux Corneilles is built from limestone, part of the geological belt known as the Calestienne that runs through the whole Famenne-Ardenne area. These limestone formations, shaped by water erosion over millions of years, are responsible for the steep rock faces that now tower above the Ourthe riverbed. The site has been recognized as one of the key geosites of the Famenne-Ardenne UNESCO Global Geopark, valued for its geological and scenic significance.

What's hidden inside the rock?

The rock mass contains four small cavities, one of which runs all the way through it. This passage is used as a training ground by cavers affiliated with the Belgian speleology union. For casual visitors, these cavities are mostly a curiosity visible from outside, and one of the features that sets Roche aux Corneilles apart from other rock faces in the area.

Why do climbers keep coming back?

The crag has been popular with climbers for decades, with the first routes established here back in the 1950s. Today it offers several dozen climbing routes of varying difficulty, from beginner-friendly lines to demanding ones, which is why the site draws both newcomers and experienced climbers looking for a challenge on solid limestone.

How do you get there?

Access is via the road from Bomal towards Aywaille, roughly 2.5 km from Bomal's main junction. Cars can be left at a hairpin bend near the ruins of Logne castle-fortress, from where a steep path descends alongside the rock toward the Ourthe. Even from the parking spot, the view over the river valley and surrounding hills gives a good preview of what's below.

Is the site open year-round?

No. To protect nesting birds, access to Roche aux Corneilles is restricted — the site is open from July 1st to January 31st, and closed from February through the end of June during the breeding season. This restriction comes from an environmental permit protecting the local birdlife nesting in the rock's crevices.

What else is worth knowing before a visit?

Beyond climbing and caving, the area around Roche aux Corneilles is popular with hikers — trails around the rock and along the Ourthe valley make for a pleasant walk with views over the river and nearby hills. The proximity of the ruined Logne castle makes it easy to combine a visit here with other historical sights in the region.

Frequently asked questions

Do you need a permit to climb here? The main condition is respecting the access period (July–January), which exists to protect birds nesting on the rock.

Can the cavities inside the rock be visited on your own? The passage that runs through the rock is used by cavers for organized training sessions, not as a self-guided tourist route.

Is there parking nearby? Yes, there is a parking spot at the bend on the road between Bomal and Aywaille, close to the ruins of Logne castle.