Best lakes around Flines-Lez-Raches offer a mix of natural features and rehabilitated industrial landscapes. The area includes the enigmatic Mer de Flines, a circular pond with historical legends and a notable depth. Just a short distance away, the Lac des Argales in Rieulay provides a diverse range of recreational activities on a former mining site. This region presents opportunities for exploring both unique natural phenomena and successful ecological transformations.
Last updated: July 6, 2026
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Beautiful walk on a magnificent site
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Hello, is it exclusively mountain biking or accessible by gravel please? It makes me want to do it anyway ☺️
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The Argales de Rieulay slag heap, the largest in the region (140 ha), has long since closed its mining page. A new story has been unfolding for several years now. That of a successful reconversion.
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Artificial beach on the body of water
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Passage over a bridge then at water level. Cool to do.
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The Jacques Vernier Park in Douai is a green space located in the heart of the city. It offers visitors an oasis of tranquility with its manicured gardens, winding paths and peaceful pond. This park is a place of relaxation appreciated by locals and tourists, offering activities such as walking, picnicking and nature contemplation.
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Today, walk to Jacques Vernier Douai Park. The park is huge, with more than 40 hectares of greenery. There are trees, flowers, lawns, ponds... It's an ideal place to recharge your batteries and relax.
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Strong exposure to the wind, beautiful view of the lake and the sunset
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The lakes in this region offer a fascinating blend of natural beauty and industrial heritage. You'll find the mysterious Mer de Flines, a circular pond steeped in local legends, alongside the Lac des Argales, a successful rehabilitation of a former mining site into a vibrant nature and leisure park.
Yes, the Lac des Argales in Rieulay is known for its excellent water quality and features an artificial beach, making it a popular spot for swimming, especially during summer. You can find more details about the beach at Terril des Argales Beach.
The Lac des Argales offers a wide array of activities. Besides swimming, you can enjoy fishing, kayaking, and sailing in designated areas. The site also features extensive trails for hiking and cycling, including a 4 km circuit around the lake. For more cycling routes in the area, check out the Cycling around Flines-Lez-Raches guide.
Absolutely. The Lac des Argales is very family-friendly, offering picnic areas, restaurants, and a shop with local products. The 4 km circuit around the lake is also accessible. Additionally, Parc Jacques Vernier is a large green space with ponds, ideal for relaxation and family outings.
The Lac des Argales has extensive trails, including a 4 km circuit. The terril (slag heap) itself offers panoramic 360° views. For more specific hiking routes, explore the Hiking around Flines-Lez-Raches guide. If you prefer running, the Running Trails around Flines-Lez-Raches guide offers several options, including a moderate loop around the Mer de Flines.
The Mer de Flines is a mysterious, almost perfectly circular pond located directly within Flines-lez-Raches. Its origin is unknown, leading to local legends of a swallowed castle. It's noted for its surprising depth (12 to 22 meters) and stable water level, and is primarily a popular spot for fishing.
Yes, mountain biking is a popular activity. The Étang des Argales is a well-known spot for mountain bikers, with possibilities to go around the lake. The route Around the Rieulay lake is also recommended for mountain biking.
Definitely. The Lac des Argales features a bird sanctuary and diverse flora and fauna, offering opportunities to observe various bird species. The terril (slag heap) at Argales provides panoramic 360° views of the surrounding landscape. The Étang des Argales also offers beautiful views and kiosks for birdwatching.
Visitors appreciate the successful reconversion of former industrial sites into recreational areas, like the Lac des Argales. Many enjoy the beautiful views, the bird sanctuary, and the diverse activities available, from mountain biking to relaxing by the artificial beach. The unique history and legends surrounding the Mer de Flines also captivate many.
Yes, the Gare d'Eau de Courcelles-lès-Lens offers a pleasant setting for cycling or taking a break. It's also a spot where fishing parties can be organized.
The lakes are enjoyable year-round, but summer is particularly popular for activities like swimming at Lac des Argales. Spring and autumn offer pleasant temperatures for hiking and cycling, with beautiful natural scenery. The Lac des Argales can get busy in summer due to its artificial beach.


Still not found your perfect lake around Flines-Lez-Raches? Check out the guides of these regions to see even more beautiful places.