Natural monuments around Courrières reveal a landscape shaped by both industrial history and ecological recovery. The region, part of the Nord-Pas-de-Calais mining basin, features re-naturalized slag heaps and protected wetland areas. These sites offer unique opportunities to explore diverse ecosystems that have emerged from former mining activities or been preserved as significant natural reserves. Visitors can discover distinct flora and fauna adapted to these environments, providing insights into nature's resilience.
Last updated: July 4, 2026
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Beautiful panoramic view of Lens and the surrounding area. Be careful when you climb onto the spoil heap during a storm, it's a real hair-raiser!
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This oak, 200 to 300 years old, would have been used by the German army during the First World War as an observation post. The panel states: "The soldiers could thus observe the artillery and enemy movements. We can still observe some of the iron bars which would have been inserted into the trunk in order to constitute a ladder. The tree having continued to grow, the majority of the bars have been absorbed by the bark."
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Don't miss the Loos-en-Gohelle slag heap, an astonishing and unusual spectacle. There are five hills made of coal waste, and this one is the highest, reaching 146 meters, the highest in Europe! Hike to the top and admire the views. You can see how nature has transformed the hills with plants, animals and even grapes. Take the opportunity to learn about this UNESCO World Heritage site and discover its rich history and culture at Base 11/19.
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Remarkable century-old oak, having participated in the history of the First World War. It is easily accessible by bicycle. Which is not the path that goes deep into the forest.
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Nice place typical of the North. Difficult in gravel in wet weather.
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Difficult to drive on the site at this time because of the "luxuriant" vegetation. Access to the karting level is blocked by padlocked gates.
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Great playground for mountain bikers! Beautiful climbs and single around the slag heaps!
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The Courrières area, part of the Nord-Pas-de-Calais mining basin, offers unique natural monuments primarily formed from re-naturalized slag heaps. Notable sites include the Leforest slag heap, known for its steep descent and panoramic views, and the Loos-en-Gohelle slag heap, which is the highest in Europe at 146 meters and offers extensive views. You can also explore Spoil heaps 74 and 74a, a popular spot for mountain bikers with a rewarding climb and view.
Beyond the re-naturalized slag heaps, the Courrières area is characterized by its riverine and canal environments. You'll find green spaces along the Canal de la Deûle and the Souchez River, which offer opportunities to observe local flora and fauna. Areas like Parc des Berges de la Souchez and Parc de Loisirs Léo Lagrange provide riparian settings, while reforestation efforts contribute to urban green spaces.
Yes, the re-naturalized slag heaps offer distinct hiking experiences, often with challenging climbs and rewarding views. For more general hiking, you can explore various running trails around Courrières, which often pass through natural areas. For example, the "Florimond Wood – Harnes Lagoon loop" or the "Deûle Canal – Marsh Pond loop" offer diverse natural settings. You can find more routes in the Running Trails around Courrières guide.
Absolutely! The slag heaps themselves, like the Leforest slag heap and Spoil heaps 74 and 74a, are popular with mountain bikers and gravelists for their challenging terrain. Additionally, the region's canals and greenways provide excellent opportunities for touring and road cycling. Routes like the "Canal de la Deûle loop" offer pleasant rides. Discover more options in the Cycling around Courrières guide.
Yes, several spots are great for families. Ladder Tree, a remarkable century-old oak, is easily accessible and offers a unique historical context. Aquaterra, la Maison de l'Environnement, is dedicated to environmental education and offers family-friendly activities. Parc des Berges de la Souchez and Parc de Loisirs Léo Lagrange also provide green spaces for relaxation and family gatherings.
Yes, several sites carry historical weight. The Loos-en-Gohelle slag heap is not only a natural monument but also a historical site, part of a UNESCO World Heritage area, offering insights into the region's mining past. The Ladder Tree, a centuries-old oak, is believed to have been used as an observation post during the First World War, with remnants of iron bars still visible in its trunk.
Spring and autumn are generally ideal for visiting the natural monuments around Courrières. The weather is typically mild, making outdoor activities comfortable. In spring, you'll see fresh greenery and blooming flora, while autumn offers beautiful colors. Summer can also be pleasant, especially in shaded areas or near water bodies like the Souchez River, though some trails on the slag heaps might have more 'luxuriant' vegetation as noted by visitors.
While specific regulations can vary, many natural areas and green spaces in Courrières, including parts of the re-naturalized slag heaps and canal paths, are generally dog-friendly. It's always recommended to keep dogs on a leash and clean up after them to ensure a pleasant experience for all visitors and to protect local wildlife.
For a comfortable visit, we recommend bringing appropriate footwear for hiking or cycling, especially if you plan to tackle the slag heaps. Water, snacks, sun protection, and a camera are also good ideas. If exploring areas with dense vegetation, long pants might be beneficial. For historical sites like the Loos-en-Gohelle slag heap, consider bringing binoculars for panoramic views.
Yes, several natural monuments offer challenging terrain. The Leforest slag heap features a very steep final descent that requires care, and its climb can be technical. The Ostricourt slag heap also includes a challenging climb and a very steep descent. These sites are particularly popular with mountain bikers and gravelists looking for a thrill.
Parking availability varies by location. For popular sites like the Loos-en-Gohelle slag heap, there are often designated parking areas at the base, such as near Base 11/19. For other sites like the Leforest slag heap or the Ostricourt slag heap, you may find roadside parking or small lots nearby. It's advisable to check local signage upon arrival.


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