Best natural monuments around Walhain offer diverse natural features. Walhain's landscape is characterized by its river sources, ancient trees, and wooded areas. The region provides opportunities to explore the natural genesis of waterways and unique geological formations. There are 6 natural monuments to discover in this area.
Last updated: May 17, 2026
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A sunken road is a road that is so deeply worn that it lies between two slopes. It is the result of centuries of use and erosion. The most beautiful sunken roads can be found especially in hilly areas with a subsoil that easily forms steep walls, such as in Haspengouw and Hageland.
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Here in Liernu, near the church, this centuries-old oak tree welcomes you.
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After the beautiful view you disappear into a sunken road...
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beautiful sunken road ascending to the plateau
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The site des Grosses Pierres is a special natural gem: the water of the Piétrebais has carved its way through some large boulders. Rocks are atypical of this area and soon stories of ghosts wandering among the 'megaliths' arose. In this special place you really imagine yourself in the Ardennes. On summer days, children can enjoy themselves here in the water and on the rocks.
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this Oak was voted "most beautiful tree in Wallonia" in 2015
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Very nice little walk!
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Walhain offers a variety of unique natural features. You can discover the fascinating Beaver Dams and Habitat, where beavers have significantly altered the landscape, or visit the site des grosses pierres, a special natural gem where the Piétrebais river has carved its way through large boulders. The region is also known for its numerous remarkable trees, including the centuries-old The Great Oak.
Yes, several natural monuments around Walhain are family-friendly. The site des grosses pierres is particularly popular, where children can enjoy playing in the water and on the rocks during summer days. The Great Oak in Liernu is also an accessible and interesting spot for all ages.
Walhain is home to a significant number of remarkable trees. A must-see is The Great Oak, located near the church in Liernu, which was voted "most beautiful tree in Wallonia" in 2015. The region also boasts hundreds of other notable trees, hedges, and alignments recognized for their landscape, historical, or botanical interest, many of which are visible from public roads.
The Walhain area features some interesting geological formations. The site des grosses pierres is notable for its large boulders, which are atypical for the region, giving it an Ardennes-like feel. Additionally, the Dongelberg Quarry, a former quartzite quarry, showcases the area's industrial geological past and now hosts a diving center.
The natural monuments around Walhain are often integrated into various outdoor routes. You can find numerous options for hiking, running, and gravel biking. For example, the area around the Sources of the Nil is often part of walking and cycling routes, allowing you to combine natural exploration with physical activity.
Yes, the Beaver Dams and Habitat is an excellent place to observe the significant impact of beavers on the landscape. You'll see impressive dams, cut trees, and even flooded walking trails, showcasing the engineering prowess of these creatures. While beavers are typically nocturnal and hide during the day, their work is clearly visible.
When visiting natural monuments like the Beaver Dams and Habitat, it's advisable to bring boots that can handle water and dirt, as some walking trails may be flooded. Generally, comfortable walking shoes are recommended for exploring the various sites and trails.
The Sources of the Nil are significant as they mark the origin of the Nil River, which flows approximately 13 km before joining the Orne. This site offers a chance to explore the natural genesis of a local waterway and appreciate the surrounding landscape, often incorporated into local walking and cycling routes.
Visitors particularly enjoy the unique natural formations and the sense of discovery. For instance, the Hollow Way Entrance to Bois de Lorensart is appreciated for its beautiful views and the small natural arch formed by a tree. The Beaver Dams and Habitat impresses visitors with the scale of beaver activity, and the site des grosses pierres is loved for its unique, Ardennes-like atmosphere and family-friendly appeal.
Many of Walhain's remarkable trees, hedges, and alignments hold historical, folkloric, or religious interest, connecting nature with the region's past. While not a natural monument, the nearby Villers-la-Ville Abbey, a significant historical and architectural landmark, offers a rich cultural experience that can be combined with natural explorations in the area.
Yes, the Hollow Way Entrance to Bois de Lorensart offers a beautiful view before leading into a sunken road. Many of the remarkable trees also serve as natural landmarks, providing scenic points within the landscape.


Extend your search for the best caves by checking out these guides of the top ones around Walhain: