Best natural monuments around Marles-Les-Mines are shaped by the region's geological processes and its history as a former mining basin in France. The landscape features re-naturalized mining spoil tips, known as *terrils*, which have transformed into biodiverse ecosystems. These sites, alongside expansive natural parks, offer unique outdoor experiences. The area provides opportunities to explore diverse flora and fauna in landscapes that blend industrial heritage with ecological regeneration.
Last updated: May 24, 2026
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Former site of Fosse 14 - Stabilized path.
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Also known as "terril de la cuisse maraine" (the slag heap of the thigh maraine), a slag heap where nature has reclaimed its rights, dotted with small paths.
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Located on the edge of the Artois hills, this slag heap dates back to 1855. It is surrounded by the Saint-Pierre woods. Ancient steps provide access to its summit.
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Carreau Valley redeveloped to highlight the mining heritage. The paths that were once dirt are now gravel, ideal for walking or cycling. Don't hesitate to go up to the terriloscope. By putting your eye at the level of the holes provided for this purpose you will see what the height of the slag heaps was in their heyday. This allows you to see the effects of time.
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when the weather is nice
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it's definitely worth the climb up
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This lake is an old quarry with a depth of 3 to 11 meters and an area of 2 hectares. Here you can fish for carp, trout, pike and other species, or simply relax on the shore and admire the view.
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The natural monuments in this region are particularly unique because they are largely shaped by the area's rich mining history. Many are re-naturalized mining spoil tips, known as terrils, which have transformed from industrial sites into biodiverse ecosystems. These, along with natural parks like Parc d'Olhain, offer a blend of ecological regeneration and historical significance.
Yes, several natural monuments are suitable for families. Vallée Carreau Park is a redeveloped historical site with gravel paths ideal for walking or cycling, and features a terriloscope that visualizes past slag heap heights. Lac de Beugin, an old quarry, is another great spot where families can relax by the water and enjoy the view.
For expansive views, visit the View of the Terrils du Pays à Part, a summit offering a super panorama. Additionally, the Belvédère in Parc d'Olhain, a 40-meter-high structure at the park's highest point, provides a 360-degree panoramic view of the former mining basin and the Artois countryside.
The re-naturalized terrils are home to diverse wildlife. For example, Terril n° 08 in Marles-les-Mines supports common toads, midwife toads, and alpine newts in its ponds, along with bird species like wood pigeons, European robins, and wrens. The unique ecosystems on these man-made hills provide habitats for various flora and fauna, some of which are rare.
Absolutely. The region offers numerous hiking trails. You can explore routes like the Vallée Carreau Park – Terril d'Auchel loop or the Ladies' Wood – Spoil tip No. 12 loop. For more options, check out the dedicated guide for Hiking around Marles-Les-Mines.
Yes, cycling is a popular activity. Vallée Carreau Park has redeveloped gravel paths suitable for cycling. For more extensive routes, consider the MTB trails or road cycling routes available in the area. You can find detailed information in the guides for MTB Trails around Marles-Les-Mines and Road Cycling Routes around Marles-Les-Mines.
The terrils are artificial hills formed from mining waste, and they are significant as they represent the region's coal mining heritage. They are now recognized as part of the UNESCO World Heritage Site of the Nord-Pas-de-Calais Mining Basin, symbolizing ecological regeneration as nature has reclaimed these industrial landscapes, creating unique biodiverse environments.
Yes, Vallée Carreau Park perfectly blends nature and history. It's a redeveloped area that highlights the mining heritage with accessible paths, while also allowing visitors to appreciate the natural transformation of the landscape. The terriloscope offers a unique historical perspective on the former slag heaps.
Lac de Beugin is an old quarry, now a tranquil lake. Visitors can relax on its shores, admire the view, or engage in fishing for species like carp, trout, and pike. It's a peaceful spot to enjoy the natural surroundings.
Consider visiting Terril de Fouqureuil, also known as "terril de la cuisse maraine." Here, nature has fully reclaimed its rights, offering a network of small paths to explore. Another interesting spot is the Spoil tip in Saint-Pierre Wood, which dates back to 1855 and is surrounded by forest, with ancient steps leading to its summit for a unique perspective.
Visitors frequently appreciate the unique blend of industrial heritage and natural beauty. The transformation of the terrils into green spaces, the panoramic views from summits like the View of the Terrils du Pays à Part, and the peaceful atmosphere of places like Lac de Beugin are often highlighted. The opportunity to explore diverse ecosystems and engage in outdoor activities in a historically rich landscape is a major draw.


Extend your search for the best caves by checking out these guides of the top ones around Marles-Les-Mines: