Best lakes around Mastaing are primarily found in the surrounding region, with the Étang des Argales in Rieulay being a significant destination. This area, part of the Nord-Pas-de-Calais mining basin, showcases a unique blend of industrial heritage and natural revitalization. The landscape features lakes formed by ground subsidence due to former mining activities, now transformed into diverse ecosystems. These sites offer opportunities for outdoor activities and wildlife observation within a historically rich context.
Last updated: May 11, 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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Strong exposure to the wind, beautiful view of the lake and the sunset
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Magnificent setting for running and doing a bit of elevation gain!
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Le Bassin Rond is a former water garage in Bouchain, France. It was constructed to enable the connection between the Canal de l'Escaut and the Sensée1. It is a popular destination for walkers and cyclists, with a 5-kilometre trail along the banks that invites you to go back in time2. There is also a sailing school called Center Départemental De Plein Air Du Bassin Rond CDPA where you can learn to sail and practice other water sports
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Magnificent natural setting. From the banks of the Scarpe to the Argales site. Simply exceptional!
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The lakes in this region, particularly the Étang des Argales, are remarkable examples of ecological rehabilitation. They were formed due to ground subsidence caused by former mining activities, specifically the weight of large spoil tips. These industrial landscapes have been transformed into vibrant natural spaces, offering a unique blend of historical significance as part of the Nord-Pas-de-Calais mining basin UNESCO World Heritage site, and rich biodiversity.
Yes, supervised swimming is permitted during the summer months (July and August) at the artificial sandy beach of Terril des Argales Beach, located on the Étang des Argales. The water quality is regularly monitored and considered excellent for bathing.
The lakes offer a variety of outdoor activities. You can enjoy hiking, running, mountain biking, and gravel biking on numerous trails around the lakes and on the terrils. Nautical sports like kayaking and sailing are also permitted on parts of the Étang des Argales. Fishing is allowed in designated areas under specific regulations. For cycling, you can explore routes like the 'Argalles spoil tip and pond. – Étang des Argales loop' or 'Towpath of the Scarpe – Argalles spoil tip and pond loop'. Find more cycling routes in the Cycling around Mastaing guide.
Absolutely. The Étang des Argales and its Terril des Argales Beach are highly recommended for families. The artificial beach provides a safe and popular spot for relaxation and swimming in summer. Additionally, the Germignies Marsh and Spoil Heap is also considered family-friendly, offering a rich natural environment to explore.
The renatured areas around the lakes, especially the Étang des Argales, boast exceptional fauna and flora. Over a hundred different bird species have been observed, along with lizards and water hens. The diverse vegetation, including prairies and forests, supports a rich ecosystem. The Germignies Marsh and Spoil Heap is known for rare plant species and is frequented by the European nightjar during nesting season.
The lakes are enjoyable year-round, but the summer months (July and August) are ideal if you wish to swim at the supervised beach of Terril des Argales Beach. Spring and autumn offer pleasant temperatures for hiking and cycling, with beautiful natural scenery. The varied vegetation ensures interesting views in all seasons.
Yes, the terrils (spoil tips) offer excellent panoramic views. The terril at Étang des Argales provides a 360-degree viewpoint of the site and the surrounding area, including the abbatial tower of Saint-Amand-les-Eaux. Trails like Around the Rieulay lake also offer magnificent views.
Yes, the area is popular for mountain biking. The Étang des Argales is known for its trails suitable for mountain bikers. You can find routes like the 'Argales Pond – Argales Pond loop' or 'The Goriaux pond – View of the Mare à Goriaux loop'. More mountain biking options are available in the MTB Trails around Mastaing guide.
Visitors frequently praise the successful reconversion of former mining landscapes into beautiful natural sites. They appreciate the diverse recreational opportunities, from swimming at the artificial beach to exploring extensive hiking and cycling trails. The exceptional biodiversity, panoramic views from the terrils, and the overall peaceful atmosphere are also highly valued by the komoot community.
Yes, the lakes, particularly the Étang des Argales, are deeply connected to the region's industrial past. They were formed as a direct result of mining activities, specifically ground subsidence caused by the weight of mining spoil tips. The area is part of the Nord-Pas-de-Calais mining basin, which is a UNESCO World Heritage site, highlighting its historical importance and the remarkable ecological transformation it has undergone.
Yes, for those seeking a challenge, the trail Around the Rieulay lake is described as a challenging lake trail, offering magnificent views. Mountain biking routes like the 'Argalles spoil tip and pond. – Étang des Argales loop' can also be quite demanding. You can find more challenging cycling routes in the Road Cycling Routes around Mastaing guide.
For more details about the Terril des Argales and its unique characteristics, you can visit the local tourism website: 10 choses à savoir sur le terril des Argales.


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