4.8
(16)
62
hikers
Lakes and Marshes of Roeux Trail
01:55
7.51km
20m
Hiking
Enjoy an easy 4.7-mile (7.5 km) hike around Lac Bleu and through the Parc de Biache, perfect for families and nature lovers.
Last updated: February 26, 2026
Tips
Includes an off-grid segment
Navigation instructions may be limited.
After 7.35 km for 79 m
Waypoints
Start point
Parking
Get Directions
127 m
Blue Lake
Highlight • Lake
Translated by Google •
Tip by
2.97 km
Étang Communal de Biache-Saint-Vaast
Highlight • Lake
Translated by Google •
Tip by
7.51 km
End point
Parking
Way Types & Surfaces
Way Types
6.35 km
984 m
182 m
Surfaces
6.66 km
464 m
388 m
Sign up to see more specific route details
Sign up for free
Elevation
Sign up to see more specific route details
Sign up for free
Weather
Powered by Foreca
Thursday 21 May
26°C
11°C
0 %
Additional weather tips
Max wind speed: 8.0 km/h
to get more detailed weather forecasts along your route
This route was planned by komoot.
Frequently Asked Questions
How long does it typically take to complete the loop?
This loop trail is approximately 7.5 kilometers long and generally takes about 1 hour and 55 minutes to complete, making it a good option for a shorter outing.
Is this trail suitable for beginners or families with children?
Yes, the trail is considered easy and suitable for all ages and fitness levels, including families. The paths are generally well-maintained and accessible.
What is the terrain like on the loop?
The terrain is diverse, featuring natural paths through woodlands, fields, and along waterways. Some sections may be asphalted. Be aware that parts of the trail, especially along marsh banks, can become muddy after rain, so appropriate footwear is recommended.
What natural features or landmarks can I expect to see?
You will encounter the beautiful Blue Lake, a former chalk quarry now a biodiversity site. The route also passes by the Étang Communal de Biache-Saint-Vaast, sections of the Scarpe river, and through the marshes of Biache-Saint-Vaast and Plouvain.
What kind of wildlife might I encounter along the way?
The area is rich in flora and fauna. You might spot various bird species, including long-eared owls, common pipistrelles, and dragonflies, especially in spring. Amphibians like the palmate newt and even deer inhabit the area. Rare plant species are also present.
Is the trail dog-friendly?
Yes, the trail is dog-friendly, but dogs must be kept on a leash at all times to protect the local wildlife and ensure safety.
What is the best time of year to hike this loop?
Spring is particularly good for observing birds and dragonflies. However, be aware that access to the Lac Bleu site itself is generally closed from June 15 to September 15 due to safety concerns. The trail is enjoyable outside of this period, but prepare for muddy conditions after rain.
Are there any permits or entrance fees required?
No, there are no permits or entrance fees required to access this trail.
Where can I park to access the trail?
As the loop starts from Rœux, you can typically find parking in or near the village to begin your hike. Specific parking areas are usually well-marked.
Does the trail intersect other well-known paths?
Yes, the route also passes through sections of the Chemin de halage du canal de la Scarpe, Entre Scarpe et Sensée, and Rue de la Carrière, among others.
Can I swim or fish in Lac Bleu?
No, bathing and fishing in Lac Bleu are strictly prohibited. The lake is a significant site for biodiversity and serves as a drinking water reservoir for nearby communities.