Mountain peaks around As offer a unique landscape shaped by its mining past, featuring several prominent spoil heaps that provide elevated viewpoints. This region, including parts of the Hoge Kempen National Park, presents a blend of natural and man-made elevations. The area is characterized by its former coal mining sites, which have been transformed into accessible hills and natural monuments. These peaks provide opportunities for exploration and offer panoramic views of the surrounding terrain.
Last updated: June 17, 2026
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The Waterschei spoil heap is one of the most striking remnants of coal mining in Belgian Limburg, located in the Waterschei district of Genk. The spoil heap originated as a waste heap from coal mining – during coal mining, rock material that did not contain usable coal was brought to the surface and piled up into an artificial hill. These centuries-old spoil heaps have since become visible landmarks in the landscape and are now deeply rooted in the region's culture and nature. The former mining area around Waterschei was active between 1924 and 1987 and played a significant role in the economic development of the Kempen coal basin. After the mines closed, the area lost its industrial function, but the spoil heaps remained as immense silent witnesses to that mining past. In 1999, the Waterschei spoil heaps were officially designated a protected landscape, emphasizing the value of these structures, not only historically but also ecologically. Today, the slag heaps are part of Thor Park, a redeveloped nature recreation and heritage area of approximately 30 hectares where industrial history and natural experiences converge. Hiking trails have been laid out around the slag heaps, often marked with small stacked stones—symbolic "cairns"—that invite visitors to climb the slopes and leave their own markings. At the top of the slag heap, you're rewarded with a panoramic view of the former mining site, forest, heathland, and the surrounding landscape. The Waterschei slag heap combines history, nature, and recreation. The hill is not only a monument to the mining industry but also a place where vegetation and biodiversity have developed on the rugged stone. As such, the slag heap offers a fascinating example of how an industrial artifact can transform into an ecologically and recreationally valuable landscape.
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The diverse ecosystems of Terril Mijn Waterschei are home to an impressive variety of flora and fauna, offering visitors the opportunity to experience nature up close. Look out for various species of birds and other wildlife that live in this peaceful environment. The reserve is ideal for family outings and offers numerous learning opportunities about the local environment and the importance of conservation. Picnic and rest areas along the trails invite you to enjoy the tranquil atmosphere and take a break. A visit to Terril Mijn Waterschei not only offers the opportunity to appreciate the beauty of nature, but also to connect with the history of the area. The site recalls the mining heritage and shows how an industrial landscape can be transformed into a thriving nature reserve - a testament to successful reclamation projects. Whether you are an experienced hiker or looking for a relaxing retreat, Terril Mijn Waterschei offers a refreshing break in nature and is a worthwhile destination for anyone exploring the area. Source: https://evendo.com/locations/belgium/hoge-kempen-national-park/attraction/terril-mijn-waterschei?currency=eur
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The section between the pebble beach and the small entrance and exit has the best open areas to look across the lake to the slag heaps (especially the twin slag heaps). And here is certainly one of them. Another not-to-be-missed section with beautiful views is here (quiet entry): https://www.komoot.com/nl-nl/highlight/6478110
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A more than beautiful area to walk with lots of variety. Make sure you grease your legs for the climbs and descents
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There is plenty to do in and around the Lieteberg Visitor Center. Take off your shoes and let your toes tingle during an adventurous trip on Flanders' most beautiful barefoot path. Hills, ladders, water and mud, ... fun guaranteed for everyone. Walked out? Dive into the Entomopolis insect museum and be surprised by the world of insects, bees and butterflies. Then look for native gems in the flowery Butterfly Garden. The best way to enjoy it is on the beautiful grass terrace of the cafeteria with a refreshing honey beer and delicious Limburg pie! (VisitLimburg)
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The Waterschei slag heap is part of the Hoge Kempen National Park. All information can be found at https://www.nationaalparkhogekempen.be/nl/thorpark
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A beautiful area with countless opportunities for walking... https://youtu.be/gudAblGSWy0?si=EXqFiINO0cwW044c
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The region around As is known for its unique elevated viewpoints, many of which are former mining spoil heaps. Among the most popular are View from Tweelingterril, which offers a challenging climb to 127 meters with fantastic panoramic views. Another favorite is Waterschei spoil heap, a protected natural monument within the Thor Park hiking area, offering varied terrain and climbs.
Yes, several spots around As are suitable for families. The View of the Terrils from the Lake is a family-friendly viewpoint where you can enjoy views of the slag heaps from open areas along the lake. Additionally, the Waterschei spoil heap, while offering climbs, is also categorized as family-friendly and is part of the Thor Park hiking area, providing a varied experience for all ages.
The peaks around As, primarily former mining spoil heaps, offer a unique blend of natural and man-made landscapes. You'll find elevated viewpoints providing panoramic vistas, and some areas, like the View of the Terrils from the Lake, offer scenic views across water bodies. The region is also part of the Hoge Kempen National Park, ensuring a rich natural environment, including nature reserves and diverse terrain.
The mountain peaks around As are primarily former coal mining spoil heaps, making them significant historical sites. For example, the Waterschei spoil heap is an old spoil heap protected since 1999, bearing witness to Genk's rich mining past. These sites have been transformed from industrial remnants into accessible hills and natural monuments, offering a unique glimpse into the region's industrial heritage.
Beyond exploring the peaks themselves, the As region offers a variety of outdoor activities. You can find numerous hiking trails, including easy and moderate options like the 'Route Station As (blauw) - Mechelse Heide' or 'View of the As Fishpond – Flemish nature reserve loop'. For cyclists, there are many road cycling routes, such as the 'As Bicycle Bridge over the N75 – Cycling among the Mijnterrils loop', and touring bicycle routes like 'Cycling through the Mechelse Heide'. Mountain biking is also popular, especially at the Winterslag spoil tip, which features numerous single trails. You can find more details on these activities in the hiking guide, road cycling guide, and cycling guide for As.
Yes, if you're looking for a challenge, the View from Tweelingterril is known for its steep climb, rewarding hikers with a fantastic view from the top at 127 meters. The Winterslag spoil tip also offers tough climbs, particularly popular with mountain bikers but also providing a strenuous ascent for hikers seeking a workout.
Visitors frequently praise the rewarding views after a climb, often describing a 'WoW feeling' from the top of peaks like Tweelingterril. The variety of terrain, from lush areas to challenging ascents, and the unique blend of natural beauty with historical mining landscapes are also highly appreciated. The opportunity to explore and experience these transformed industrial sites as natural monuments is a key draw.
Yes, the region offers trails suitable for beginners and those looking for easier walks. While specific 'beginner mountain trails' are not explicitly listed as highlights, the overall area, being part of the Hoge Kempen National Park, includes accessible paths. For example, the 'Route Station As (blauw) - Mechelse Heide' is an easy hiking route. The Lieteberg Barefoot Trail Entrance also leads to family-friendly trails, though it's not a mountain peak itself.
While the main peaks are well-known, the entire region, with its transformed mining landscapes, offers a unique experience. The View of the Terrils from the Lake provides a distinct perspective of the spoil heaps from across the water, offering a serene and picturesque setting away from the direct climbs. Exploring the various trails within the Thor Park hiking area around the Waterschei spoil heap can also lead to less crowded, beautiful spots.
The highest point explicitly mentioned among the popular peaks is the View from Tweelingterril, which reaches an elevation of 127 meters. While not towering like traditional mountains, these elevated spoil heaps provide significant climbs and extensive views over the surrounding flat landscape.
Yes, the region's peaks are closely linked to nature conservation. The Waterschei spoil heap is a protected natural monument and is part of the Hoge Kempen National Park. This park encompasses a significant portion of the area, ensuring that these unique landscapes are preserved and offer diverse natural experiences alongside their historical significance.


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