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Hiking trails & Routes
France
Hauts-De-France
Douai
Rieulay

Terril des Argales Loop

Easy

4.5

(11)

28

hikers

Terril des Argales Loop

01:17

4.88km

40m

Hiking

Hike the easy 3.0-mile (4.9 km) loop at Terril des Argales from Rieulay, offering unique views and rich biodiversity in Scarpe-Escaut.

Last updated: February 26, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional Scarpe-Escaut

Waypoints

A

Start point

Parking

Get Directions

1

482 m

Étang des Argales

Highlight • Lake

Unmissable heap for mountain bikers in the sector. Also accessible in gravel if you limit yourself to the tour of the lake.

Translated by Google •

Tip by

2

3.73 km

Terril des Argales

Highlight • Natural Monument

Very nice layout around the pond, which is an ornithological reserve. The slag heap is on the other side.
Different promontory which allows to have an unobstructed view of the region.

Translated by Google •

Tip by

B

4.88 km

End point

Parking

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Way Types & Surfaces

Way Types

2.86 km

1.95 km

< 100 m

< 100 m

Surfaces

3.02 km

1.30 km

474 m

< 100 m

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Elevation

Elevation

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Weather

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Saturday 23 May

31°C

14°C

-- %

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This route was planned by komoot.

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Frequently Asked Questions

How difficult is the Terril des Argales loop from Rieulay?

This trail is generally considered easy. It features gentle and regular slopes, making it accessible for many hikers, including families. Benches are installed along the route for resting.

What is the terrain like on the Terril des Argales loop?

The terrain is diverse, featuring stable, developed paths that often have a charcoal-like appearance, reflecting its mining past. While most slopes are gentle (3-5%), some sections can reach 6-10%. You'll encounter wet prairies, marshes, and wooded areas with different substrates of red and black schists. Note that the flanks of the terril are friable, and access to specific zones with high temperatures or toxic gas is prohibited for safety.

What can I see along the route?

The trail offers a captivating mix of industrial heritage and thriving nature. You'll pass by the large, naturally formed Étang des Argales, complete with a beach. From the belvederes, you can enjoy panoramic 360-degree views of the surrounding area. The site is also a Terril des Argales, the largest flat mining spoil heap in Europe and a UNESCO World Heritage site, now a haven for biodiversity.

Where can I park for the Terril des Argales loop?

Parking facilities are available at the site, making it convenient to access the trailhead. The area is well-equipped with amenities for visitors.

Are dogs allowed on the Terril des Argales trail?

Yes, dogs are generally allowed on the trails. However, it's always recommended to keep them on a leash, especially given the site's rich biodiversity and status as a bird sanctuary.

What is the best time of year to hike the Terril des Argales loop?

The trail is enjoyable year-round, but spring and autumn offer pleasant temperatures and vibrant scenery. The site is a biodiversity hotspot, so visiting during warmer months increases chances of spotting birds, lizards, and amphibians.

Are there any entrance fees or permits required to access the Parc naturel régional Scarpe-Escaut?

No, there are no specific entrance fees or permits required to access the Parc naturel régional Scarpe-Escaut or the Terril des Argales loop. The site is freely accessible to the public.

Is this trail suitable for families with children?

Absolutely! The Terril des Argales loop is considered 'Facile' (easy) and is very suitable for families. The well-maintained paths, gentle slopes, and available amenities like playgrounds and picnic sites make it a great option for outings with children.

Does the trail intersect other well-known paths?

Yes, the route also passes through sections of the De Bon-Secours à Arras, La Chapelle du Marais, and Le Marais des Onze Villes trails.

Are there any facilities or amenities available along the trail?

Yes, the site is well-equipped with amenities. You'll find playgrounds, picnic sites, restrooms, and even shelters. There are also restaurants nearby, and a chèvrerie (goat farm) on-site where you can taste local goat cheeses.

What makes the Terril des Argales unique?

The Terril des Argales is unique because it's the largest flat mining spoil heap in Europe, spanning 140 hectares, and is inscribed on the UNESCO World Heritage list. It's a prime example of a successful reconversion of an industrial site into a protected natural space and leisure area, boasting exceptional biodiversity and recreational opportunities.

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