Best natural monuments around Colfontaine offer diverse natural features and historical landscapes. The region is characterized by its significant natural heritage, including vast forests and ecologically rich slag heaps. These areas provide opportunities to explore varied flora, wildlife, and geological formations. Visitors can discover a blend of natural beauty and historical significance within these protected sites.
Last updated: October 29, 2026
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It is at the confluence of the Trouille and the Nouvelles river that this waterfall bridge was born. Originally there was a mill, which was turned into a tannery after the First World War. Today it is a bucolic place surrounded by nature.
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This is a summit climb. Especially on the adventurous side. There are ropes there to hoist you up. The other side is a nice wide walking path. In my opinion, the most beautiful slag heap on the GR 412.
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The Crachet slag heap is a Site of Great Biological Interest (SGIB). It is also part of the Natura 2000 network to protect its exceptional fauna and flora. Located a stone's throw from the SPARKOH science museum! (former PASS), the slag heap is a fabulous educational tool which regularly welcomes school visits but also families looking for calm and nature. Thanks to its marked and well-equipped paths with stairs, small bridges, duckboards and ropes, its ascent is easy despite a difference in altitude of around 70 m. Relatively wooded, the Crachet sometimes gives way to magnificent grassy wastelands and a few ponds which encourage the development of great biodiversity. Its summit, located at an altitude of 140 m, offers a beautiful panoramic view of the Borinage slag heap range as well as the SPARKOH! site, built by the architect Jean Nouvel. In this place, the ground is adorned with red and black. Smoke can even be observed in certain places because the heap is still burning more than 60 years after the closure of the site. coal mining. https://www.destinationterrils.eu/nl/terril-du-crachet
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Puits N° 1 de la SA du Charbonnage de la Grande Machine à Feu de Dour In 1891 an explosion took place here in the underground. 21 miners lost their lives. Around that time, coke ovens were also built near the mine. The shafts had a depth of 970 meters. In 1913, the company had 1067 employees divided between the N°1 and the mine "Frédéric" (N°2). During that year, 148070 tons of coal was extracted. Frédéric closed on January 6, 1932. The N°1 closed on November 30, 1954. A company is located on the mine site. A few small buildings survived. The slag heap is still partly (flattened) present. In May 2021, it was decided to demarcate three zones. A first (terril) will become a nature reserve, a second zone will become an athletics track with grandstands (Dour Sports) and a third zone will be filled with solar panels, as is the case in neighboring Vedette. https://www.belgischesteenkoolmijnen.be/borinage/grande-machine-%C3%A0-feu/
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Behind the wall, the old pit of the Great Fire Engine.
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Behind the wall, the old pit of the Great Fire Engine
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The bridge/waterfall was built at the confluence of the Trouille and the Rivière de Nouvelles. In the early, late 12th century, there was an old domanial mill on the site, the Moulin-au-Bois. Imagine that there was a dike on the site of the current street, a large fish pond on the site of the pasture, and that there were three mill wheels instead of one. This is what the site used to look like. In 1823 the mill was sold by the city of Bergen and after the First World War it was converted into a tannery. The only remnant of the mill that is still visible today is part of the wall along the street, just before the bridge. Still, the waterfall remains one of Hyon's most symbolic places.
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The region around Colfontaine is rich in natural monuments, including the vast Colfontaine Forest, the ecologically significant Marcasse slag heap, and the tranquil Hyon Waterfall and Ponds. Other notable sites include the Crachet slag heap and Terril Saint-Antoine, both offering unique natural and historical insights.
The Colfontaine Forest is characterized by diverse flora, including a wide array of trees like hazel, hornbeam, ash, maple, and oak. It's a haven for wildlife and boasts varied plant diversity. You'll find picturesque valleys where the Elwasmes and Colfontaine streams flow, and small ponds that provide habitats for dragonflies.
Yes, several natural monuments are suitable for families. The Colfontaine Forest offers the 'Rando des Leus,' a 5 km yellow-marked trail particularly appealing for children, inviting them to spot red squirrels or roe deer. The Hyon Waterfall and Ponds provide a peaceful setting for a family outing, and the Mayeur Garden is also family-friendly. The Crachet slag heap is also considered an excellent educational tool for families and school visits.
The slag heaps, such as the Marcasse, Crachet, and Terril Saint-Antoine, are remnants of the region's rich coal mining past. They offer a fascinating blend of industrial heritage reclaimed by nature. For instance, the Colfontaine Forest still holds remnants like the concrete headframe of the Sauwartan mine, and the Marcasse slag heap is where Vincent van Gogh briefly shared the lives of miners in 1879.
The natural monuments around Colfontaine are excellent for various outdoor activities. The Colfontaine Forest features over 30 to 60 km of marked trails for walking or cycling. The Crachet slag heap has marked paths, stairs, and bridges for an accessible ascent. For cycling enthusiasts, there are numerous MTB trails, gravel biking routes, and road cycling routes in the vicinity.
Yes, several natural monuments offer spectacular views. The slag heaps, in particular, are known for their panoramic vistas. The summit of the Crachet slag heap, at an altitude of 140 m, provides a beautiful panoramic view of the Borinage slag heap range. Similarly, the Terril Saint-Antoine also offers panoramic views over the green canopy.
While specific seasonal tips are not available, the natural monuments, especially the forests and slag heaps, are generally enjoyable during spring, summer, and autumn when the flora is vibrant and weather conditions are mild for outdoor activities like hiking and cycling. Winter can also offer a unique, serene experience, though some paths might be more challenging.
The Marcasse slag heap is a compelling example of nature reclaiming an industrial site. It has been transformed into a nature reserve, supporting a unique ecosystem with rare plants, birds, and insects. It beautifully combines the region's industrial past with biodiversity conservation, offering a fascinating environment for ecological study and appreciation.
The Colfontaine Forest is recognized as a major ornithological reserve, making it an excellent spot for birdwatching. The Crachet slag heap is a Site of Great Biological Interest, part of the Natura 2000 network, protecting its exceptional fauna and flora, including magnificent grassy wastelands and ponds. You might also spot trees with mistletoe, an evergreen semi-parasite with cultural significance.
While many trails are accessible, some areas offer more challenging routes. The Terril Saint-Antoine is noted for its challenging routes, and the Crachet slag heap, while having accessible paths, involves a summit climb with ropes in some sections, appealing to those seeking a more adventurous ascent.
For more detailed information about the Colfontaine Forest, including its features and visitor information, you can refer to external resources such as visitmons.be.


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