Best natural monuments around Marchin feature a diverse natural landscape characterized by an infinite variety of plateaus, hills, and valleys. The region is refreshed by several rivers, including the Hoyoux, Triffoy, Lileau, and Vyle, which contribute to scenic river valleys. Extensive woods and pastures provide habitats for local wildlife and offer tranquil settings for nature appreciation. This varied terrain offers numerous opportunities for outdoor enthusiasts seeking natural features around Marchin.
Last updated: June 28, 2026
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The gravel pit is a very rich site for photo enthusiasts or for walkers who wish to walk on maintained paths and observe birds in complete tranquility. Site recommended for walkers and photographers. Please, can you respect the rules such as keeping your dog on a leash (even if some people think they won't do any harm by letting their dog off the leash, know that you have animals with predator instincts which could scare away some species of birds that nest on the ground, like the kingfisher) and not swimming so as not to disturb the birds that are there. Thank you to all those who will respect the rules and I wish you a good hike or a good photo outing 🙏.
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Excavations are conducted year-round at Moha Castle, making it unique in Belgium. When I visited, two archaeologists were uncovering a wall that runs beneath the visible castle and likely dates back to the 12th century.
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The castle is free to visit. At the foot of the rock, there's a visitor center where you can pick up a badge to open the gate. For €4, you can also get a brochure with information about the most important points. The castle is only open to visitors starting in April, but the friendly man at the visitor center let me in on February 27th... as far as you can even call it "inside" at this ruin ;-)
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The exact origins of the medieval County of Moha remain unknown. It is likely that the county was formed during the fragmentation of the Carolingian Empire and the Hesbaye region at the end of the 9th century. The first known count, Albert of Moha, is mentioned in a document dated 1026 or 1028. The first defensive stone walls also date from the first half of the 11th century. Having no male heir, Albert of Moha married his daughter to Henry I of Dasbourg around 1050, thus linking the county's destiny to that of this powerful family of Alsatian origin. Initially, it is highly unlikely that the Counts of Dasbourg regularly resided in Moha, entrusting the county's administration to trusted men and a small garrison. However, the situation changed with Hugh II (1130-1180) and his son Albert II (d. 1212), who decided to become more involved in the region's politics. Albert II, in particular, chose to align his interests with those of his nephew, Duke Henry I of Brabant, whose policies he would follow until the end of the 12th century. In 1204, Count Albert III, having lost hope of having a son, chose the Prince-Bishop of Liège as his heir. But the late birth of his daughter Gertrude would jeopardize these agreements. Quickly betrothed to Thibaut of Lorraine, who died in 1219, she then married Thibaut of Champagne, who repudiated her, and subsequently Simon of Linange. At 19, she died childless. On March 19, 1225, the Prince-Bishop of Liège, Hugues de Pierrepont, took possession of Moha. Under the Prince-Bishops, Moha became a prison for political prisoners and a fortification tasked with controlling the city of Huy and blockading merchants. This policy was deeply unpopular and led to reprisals: the people of Huy besieged Moha in 1255. The fortress of Moha was considered impregnable. It was therefore through trickery that the people of Huy, taking advantage of a request for a truce, seized the castle on May 6, 1376. After the attack on the castle, the site's history is largely unknown. Mass is still celebrated twice a year in the castle chapel. During the 18th century, the ruins served as a refuge for a hermit. The castle's stones were gradually plundered, notably to build the surrounding houses. In 1889, the ruins of the castle were purchased by the Belgian state. Source: https://chateaumoha.be/histoire
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The "Rocher du Château de Moha" is a limestone outcrop rising from the Mehaigne valley. It was a strategically important site in the Middle Ages, when more castles were built on rocks. This made the site difficult to besiege, and it was well-placed as a control point over the valley. The rock is very recognizable in the landscape. The ruins on the rock are still clearly visible, and the medieval structures are still easily recognizable.
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Located in the Solières valley near Huy, the Trou Manto cave is a limestone cave with a complex network of tunnels. Access is via a steep path supported by a rope. The cave has three levels with magnificent stalactites, a sloping floor with collapses, and twelve large columns supporting the vaults. The entire structure is an impressive karst phenomenon, approximately 600 meters long and 48 meters deep. The cave is protected and fenced off due to vandalism and to protect bats; visits are only possible with a guide or a caving association. The cave is known for its diverse hydrological phenomena and the legend of the Nutons, gnome-like helper beings from folklore. This combination of nature, history, and mythology makes Trou Manto a special place.
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A collection of four caves, two of which are closed off as bat roosts. A steep climb or descent over a rocky path is definitely worth it.
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The unique natural phenomenon of the Poudingue d’Ombret: a type of rock formed from deposits of river alluvium, approximately 395 million years old, with large stones surrounded by smaller sediments.
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Marchin is characterized by a diverse natural landscape featuring an infinite variety of plateaus, hills, and valleys. The region is refreshed by several rivers, including the Hoyoux, Triffoy, Lileau, and Vyle, which create scenic river valleys. You'll also find extensive woods and pastures, providing tranquil settings and habitats for local wildlife. This varied terrain offers numerous opportunities for outdoor enthusiasts.
Among the most popular natural monuments, you can explore the impressive Modave Castle, which dominates the Hoyoux valley and offers beautiful gardens. Another must-see is Moha Castle, a medieval feudal castle built on a rock with stunning views. For a unique geological experience, visit the Poudingue d'Ombret Trail, showcasing ancient river delta sediments.
Yes, several natural monuments are suitable for families. Modave Castle is family-friendly, with gardens that can be explored freely. The Amay Gravel Pit is also an excellent choice, offering a 2.5-kilometer path with educational panels for bird watching and leisurely walks, described as a 'wonderful family walk' by visitors.
Absolutely. The Poudingue d'Ombret Trail features a unique geological formation of conglomerate rock, known as 'Ombret pudding.' This site reveals sediments from a river delta that flowed into the sea 395 million years ago, offering a fascinating glimpse into ancient geological processes. The narrow trail also provides a beautiful view over the valley.
Yes, you can explore the Trou Manto, a limestone cave located in the Solières valley near Huy. It features a complex network of tunnels, magnificent stalactites, and is an impressive karst phenomenon. Access involves a steep path, and while two of its four caves are closed for bat protection, it offers a challenging and rewarding experience for those interested in caving.
The varied terrain around Marchin is perfect for outdoor activities. You can find numerous routes for gravel biking, road cycling, and general cycling. For example, explore routes like the 'Forest Stream – Downhill Forest Trail loop from Huy' for gravel biking or the 'Wall of Huy – Mur de Huy loop from Barse' for road cycling. You can find more details on these and other routes in the Gravel biking around Marchin, Road Cycling Routes around Marchin, and Cycling around Marchin guides.
Definitely. The Amay Gravel Pit is a protected natural area of 44 hectares, including 21 hectares of water. Recognized as a Wetland of Biological Interest, it is home to over 120 species of birds. The site features reed beds, gently sloping banks, and a path with educational panels, making it ideal for birdwatching and nature walks.
Visitors particularly appreciate the diverse outdoor experiences offered by the region. They enjoy the stunning views from historical sites like Moha Castle, the unique geological insights of the Poudingue d'Ombret Trail, and the tranquil nature walks at places like the Amay Gravel Pit. The combination of natural beauty, historical significance, and varied terrain makes Marchin a rewarding destination for exploration.
Marchin's varied topography of plateaus, hills, and valleys offers superb walks in all weathers, meaning you can enjoy the natural monuments throughout the year. However, for exploring castles like Modave Castle, which has specific opening hours from March to November, checking their website for current schedules is advisable. Generally, spring and autumn offer pleasant temperatures and beautiful scenery for outdoor activities.
Yes, for those seeking a challenge, the Trou Manto cave involves a steep climb or descent over a rocky path, making it a challenging experience, especially in wet weather. The Poudingue d'Ombret Trail also recommends sturdy walking shoes due to its narrow path, offering an intermediate challenge with rewarding views.
Marchin is known for its historical castles that are also considered natural monuments due to their integration with the landscape. You can visit Modave Castle, a magnificent castle dominating the Hoyoux valley, and Moha Castle, a medieval feudal castle built on a prominent rock at the confluence of rivers. Both offer historical insights alongside natural beauty and strategic viewpoints.


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