Lakes near Mons-En-Barœul, a suburb of Lille in northern France, offer accessible natural spaces within an urban setting. While large natural lakes are not prominent, the area features notable urban parks with water bodies. The Parc du Baroeul, for instance, provides a tranquil lake setting with winding trails and green landscapes. These natural water bodies around Mons-En-Barœul serve as local retreats for recreation and nature appreciation.
Last updated: July 6, 2026
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The filter ponds in Leers were built to supply water to the Roubaix Canal, which is located nearby. Their primary function is to purify some of the water from the Grimonpont wastewater treatment plant. This plant initially filters 75% of the water; the ponds then process the remaining 25%. This final filtration takes seven days. During this process, the water flows through several ponds, moving from one to the other by gravity. This filtration technique is called phytoremediation: the water is naturally purified by algae, plants, and microorganisms that thrive in these ponds. In Leers, plants such as yellow iris and purple loosestrife, among others, play this purifying role. After seven days of filtration, the water flows into a final 9,000 m² basin. At this stage, it is perfectly purified and of very high quality. This final basin, known as the "storage basin," is the final step before the water is conveyed to the canal. The Leers filter ponds, formerly a landfill, are now a peaceful 5-hectare nature reserve, perfect for a relaxing walk, alone or with the family. The area is home to around thirty bird species, including the coot, the Mediterranean gull, and the reed bunting. If you look closely, you might even be lucky enough to spot a smooth newt swimming in the ponds, searching for small invertebrates to feed on. To protect the environment and wildlife, dogs must be kept on a leash on the paths and are not permitted in the winding sections of the ponds. Source: enm.lillemetropole.fr
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Just before Heron Park, a pretty little lake with easy access. Can be done on a gravel bike or mountain bike. There are quite a few hikers on weekends.
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still as pleasant and for all levels
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A beautiful place to run between lake and forest. It is a haven of peace in the middle of the Lille metropolis.
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Beautiful place, close to the metropolis and yet in nature
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While Mons-En-Barœul, a suburb of Lille, doesn't feature large natural lakes exceeding 1 km², the area offers notable urban parks with significant water bodies. These include natural areas like Heron Lake and man-made filtration ponds, providing tranquil settings for recreation and nature appreciation.
Yes, several lakes and parks are suitable for families. The Heron Lake area is popular with trails and green spaces. The Parc du Baroeul, though not listed as a highlight, features playgrounds and open fields, making it ideal for families. The Spanish Lake also offers easy access for family outings.
The lakes provide excellent opportunities for various outdoor activities. You can enjoy hiking, running, and cycling on the trails surrounding them. For instance, there are numerous hiking routes and running trails that incorporate the lake areas, such as the Heron Lake loop or routes near Spanish Lake. Cycling is also popular, with options for gravel and mountain biking.
Absolutely. Heron Lake is surrounded by meadows, woods, and trails, offering a protected site for walks. The Parc du Baroeul also boasts winding hiking trails. For more structured routes, you can explore hiking guides that feature easy loops around lakes like the Spanish Lake.
Generally, dogs are welcome on trails, but specific rules apply to certain areas. For example, at the Leers Filtration Ponds, dogs must be kept on a leash on the paths and are not permitted in the winding sections of the ponds to protect the environment and wildlife.
Many visitors recommend visiting the lakes during sunrise or sunset for the most beautiful views. The Rest area at Behnenwald is particularly noted for offering a beautiful corner of nature that is best enjoyed during these times.
The Leers Filtration Ponds are unique as they are a man-made system designed for water purification, now transformed into a peaceful 5-hectare nature reserve. They use phytoremediation, where plants like yellow iris and purple loosestrife naturally purify water. This area is home to around thirty bird species and even smooth newts, making it a fascinating spot for nature observation.
The Parc du Baroeul in Mons-En-Barœul can be considered a hidden gem. It features a large, tranquil lake, winding trails, and vibrant flower beds, offering a serene escape from the urban environment. Historically, a portion of the park was an orchard, adding to its charm.
Visitors appreciate the accessibility of natural spaces within an urban setting. They enjoy the tranquility, the rich biodiversity, and the opportunities for walking, cycling, and observing nature. The areas around Heron Lake are particularly valued for being close to the metropolis yet offering a true natural experience.
Yes, several lakes offer good cycling opportunities. Spanish Lake, for example, is suitable for gravel biking or mountain biking with easy access. You can find various cycling routes that pass by or around these water bodies, providing scenic rides.
The lakes and surrounding natural areas are home to diverse wildlife. At Heron Lake, you can find rich biodiversity, including many species of birds and plants. The Leers Filtration Ponds are a nature reserve known for around thirty bird species, such as the coot and reed bunting, and even smooth newts.


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