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France
Hauts-De-France
Douai

Masny

Top 4 Natural Monuments around Masny

Natural monuments around Masny include a variety of sites, from former industrial landscapes transformed into natural areas to wetlands and unique geological features. The region's terrain, shaped by both natural processes and historical activities, offers diverse environments for exploration. These areas provide opportunities to observe local biodiversity and experience distinct natural features. The vicinity of Masny features several significant natural sites of interest.

Best natural monuments around Masny

  • The most popular natural monuments is Terril des Argales, a natural monument with a layout around a pond. This pond functions as an ornithological reserve, and the slag heap provides various promontories for unobstructed views of the region.
  • Another must-see spot is Terril de Roeulx, a natural monument and heap with schist tracks. Visitors can access the area by mountain bike and gravel, with the possibility of reaching the top for panoramic views of the surroundings.
  • Visitors also love Roost-Warendin Slag Heap 138, a natural monument located near the College of Roost-Warendin. It features numerous single tracks forming a labyrinth among birch trees, offering a varied terrain for exploration.
  • Masny is known for its transformed industrial landscapes, wetlands, and historical geological features. These sites offer diverse opportunities for exploring local biodiversity and unique terrain.
  • The natural monuments around Masny are appreciated by the komoot community, with more than 20 upvotes and over 30 photos shared.

Last updated: May 20, 2026

the stone that grows

Highlight • Historical Site

Very beautiful monument of local history to discover during a walk in nature.

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Roost-Warendin Slag Heap 138

Highlight • Natural Monument

Small heap located near the College of Roost-Warendin. It is less known than its neighbor of the Paturelles (bigger and more fun), but it deserves a trip if you are in the area. You will find lots of little singles forming a real labyrinth in the middle of birch trees (with passages sometimes very narrow). Don't hesitate to get lost ... without forgetting a very steep little climb for the more athletic!

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Terril 125 of Sainte-Marie

Highlight • Natural Monument

A small part is accessible by bicycle but you will have to cross a few rocks which prevent motor vehicles from venturing there.

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Terril de Roeulx

Highlight • Natural Monument

Heap and nice natural area with schist tracks. Accessible by mountain bike and gravel.
Possibility of reaching the top, which is not very high, but which allows to have a panoramic view of the surroundings.

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Germignies Marsh and Spoil Heap

Highlight • Natural

You can enjoy this site composed of several natural and artificial ponds. It is a rich natural environment with a birch forest. There are many rare plant species and the European nightjar frequents the site during the nesting period.

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Tips from the Community

Jean Pierre
April 20, 2025, Terril 138 de Roost-Warendin

beautiful mountain bike playground

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The menhir is located in the marsh of Aubigny-au-Bac, on a footpath leading to Brunémont. It is a block of Landenian sandstone 2.90 m high (including 1.48 m above ground) by 2.15 m wide and 0.70 m thick. It is said to have been sunk to about 2.40 m. Shaped like a horse's head, it is associated with a prehistoric megalith despite the absence of evidence.

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You can enjoy this site composed of several natural and artificial ponds. It is a rich natural environment with a birch forest. There are many rare plant species and the European nightjar frequents the site during the nesting period.

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You can enjoy this site composed of several natural and artificial ponds. It is a rich natural environment with a birch forest. There are many rare plant species and the European nightjar frequents the site during the nesting period.

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Mandatory and iconic stopover in the region

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Max
February 11, 2022, la pierre qui pousse

Very beautiful monument of local history to discover during a walk in nature.

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It is a magical place, sheltered in a small clearing, which is accessed by a footbridge. Don't make (too much) noise ...

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fairly steep climb but not too high (40m D +)

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Frequently Asked Questions

What are some of the most popular natural monuments to explore around Masny?

Visitors frequently enjoy the transformed industrial landscapes. Among the most popular are Terril des Argales, known for its layout around an ornithological reserve pond and panoramic views, and Terril de Roeulx, which offers schist tracks for mountain biking and gravel cycling, leading to a summit with broad views of the surroundings.

Are there any natural wetlands or marshes near Masny worth visiting?

Yes, the Marais de Wagnonville, located just north of Douai, is a regional nature reserve. It features a rich diversity of aquatic environments, including a main pond, reed beds, a sphagnum peat bog, and woodlands. It's an excellent spot for nature observation and birdwatching, home to over 100 animal species and around 200 plant species.

What unique geological features can be found in the natural monuments around Masny?

The region is characterized by its transformed industrial landscapes, particularly slag heaps, which are man-made hills of mining waste that have been reclaimed by nature. These sites often feature distinct areas with red and black shale. Additionally, you can find unique historical elements like the stone that grows, a listed historical monument and a block of Landenian sandstone with local legends surrounding it.

What outdoor activities can I do near these natural monuments?

The natural monuments around Masny offer diverse opportunities for outdoor activities. Many slag heaps, like Roost-Warendin Slag Heap 138, provide varied terrain for hiking and mountain biking with numerous single tracks. The gravel biking routes around Masny and general cycling routes often incorporate these natural areas, offering scenic rides.

Are there family-friendly natural monuments around Masny?

Yes, several sites are suitable for families. The stone that grows is listed as family-friendly, offering a short walk to a historical monument in a clearing. The Terril de Rieulay, while not a highlight in the guide, is a repurposed industrial site with a pond and beach, offering activities like canoeing and paddleboarding, and even a goat farm, making it a great family destination.

What is the best time to visit the natural monuments around Masny?

The natural monuments are generally accessible year-round. Spring and autumn offer pleasant temperatures for hiking and cycling, with vibrant foliage or blooming flora. Summer is ideal for water-based activities at sites like Terril de Rieulay, which features a beach. Winter can offer a different, serene perspective, though some paths might be muddy.

Are there good viewpoints within the natural monuments?

Yes, many of the transformed slag heaps provide excellent viewpoints. For instance, Terril des Argales offers various promontories for unobstructed views of the region. Similarly, reaching the top of Terril de Roeulx provides a panoramic perspective of the surrounding landscape.

What kind of trails can I expect at these natural monuments?

You'll find a variety of trails. Many slag heaps, such as Roost-Warendin Slag Heap 138, feature numerous single tracks forming a labyrinth among birch trees, offering varied terrain. Other sites, like Terril 125 of Sainte-Marie, have trails accessible by gravel bike, though some may require navigating rocks. The Terril de Rieulay also boasts numerous paths for hiking and mountain biking.

What makes the Terril de Rieulay a significant natural site?

The Terril de Rieulay, though not a highlight in this guide, is the largest slag heap in the region, covering 140 hectares. It's significant because it has been successfully transformed into a vibrant natural and recreational area. It features an expansive pond with a beach, a nautical base for water sports, and an ornithological reserve. Its diverse landscape, including distinct shale areas and panoramic views, makes it a unique blend of ecological interest and outdoor recreation.

What do visitors enjoy most about the natural monuments around Masny?

Visitors particularly appreciate the unique transformation of industrial landscapes into natural havens. They enjoy the diverse opportunities for outdoor activities like mountain biking on challenging single tracks, gravel cycling on scenic routes, and hiking to viewpoints. The blend of natural beauty with historical industrial heritage, and the chance to observe local wildlife, are frequently highlighted as key attractions.

Are there any historical or cultural sites integrated with the natural monuments?

Yes, the region's history is often intertwined with its natural sites. For example, the stone that grows is a historical monument, a menhir listed since 1979, located within a natural clearing. The slag heaps themselves, like Terril 125 of Sainte-Marie, represent a significant part of the region's industrial past now reclaimed by nature, offering a unique cultural landscape to explore.

Is public transport available to reach these natural monuments?

While specific public transport routes directly to every natural monument might be limited, Masny and surrounding towns are generally served by regional transport networks. It is advisable to check local bus schedules or regional train connections to nearby towns and then consider a short walk or taxi to the specific sites. For detailed planning, local tourism offices can provide the most up-to-date information.

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EsquerchinSin-Le-NobleFaumontFlers-En-EscrebieuxCantinAuchy-Lez-OrchiesRaimbeaucourtAubyRoost-WarendinRoucourtDechyWaziersFlines-Lez-RachesCoutichesLambres-Lez-DouaiCuincyGœulzinLauwin-PlanqueMonchecourtRâchesGuesnainLewardeErchinVillers-Au-TertreAnhiersLallaingÉcaillonFérinCourchelettesArleuxFressainFéchainAubigny-Au-BacBugnicourtBrunémontFenainWandignies-HamageHornaingErreMarcq-En-OstreventPecquencourtAuberchicourtAnicheLoffreHamelEstréesLécluseMarchiennes

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