In Thiérache, starting from Viroinval

The Thiérache is a fragmented region, spread across two countries, three French departments (Nord, Aisne and Ardennes) and two Belgian provinces (Hainaut and Namur).
As you wander through the forest, discover the Namur part of the Thiérache, with the Ry d’Alyse forming the border with France, the remains of the now-abandoned slate quarries, and also the site of the Centre of Europe from the time when there were only 15 of us and the United Kingdom was still part of it.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 15.98 km
  • ◔
    Average duration: 5h 45 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 403 m
  • ↘
    Descent: - 403 m

  • ▲
    Highest point: 389 m
  • ▼
    Lowest point: 171 m

Photos

Description of the walk

Parking at the junction between Rue de Revin and Rue de l'Ardoisière, on the edge of the forest, after the campsite on Rue de Revin.

(S/E) At the junction, facing the campsite, turn right onto Rue de l'Ardoisière. At the N990, continue straight ahead along the path, crossing diagonally to the right. Pass the buildings and walk along the path on the right leading under the trees.

Nordic trail markers 3, 4 and 5

At the road, turn right and then take the road straight ahead; walk for 700 m to a gate, leaving the markings behind.

No Markings

(1) Go past it and turn immediately right onto the path (not shown on the IGN map), which is poorly marked at the start and leads into the ferns, with a tree at the entrance bearing a vertical red and white mark. Continue straight on at the poorly marked junction. Join a path and continue straight on. The path turns left. At the junction (not shown on maps), continue straight on. At the clearly marked crossroads, after a tree marked 18, look for a path on your right.

(2) Turn right and head down the path (not shown on the OSM map). Cross the wide forest track and continue straight ahead along the path (not shown on the OSM map). It becomes much better marked very quickly. The path turns left to pass tall birch trees and heather. At a pile of branches on the ground, go round to the left and, at the next pile, to the right to rejoin the path.

(3) Step over a stream and follow the path (not shown on the OSM map) as it enters a mixed forest of conifers and deciduous trees. You will come to the glass sculpture representing the Centre of the EU-15, surrounded by markers for each country bearing the year of accession. Walk down to the N990.

(4) Turn left. Cross the car park and take the forest track on your left, near the fenced-off plot. Walk for about 800 m, passing the Ruisseau de Broctay and, further on, asecond stream channelled beneath the track, ignoring the paths on either side until you reach a clearly marked junction.

(5) Turn right. At the fork, turn left and, at the crossroads immediately after, left again. At the open area forming a large crossroads, turn right towards a house and the hamlet known as Le Risque Tout.

Green Cross markings

Take the path to the left of the house and head downhill. At the junction, turn right. Walk for 400 m along the boundary; boundary markers are there to remind you. Ignore the path branching off to the left; you’ll rejoin it further on. Head downhill.

(6) Quickly take a path on your right, leaving the wide forest track behind. At the crossroads, turn left. Further down, ignore the path on your right. At the crossroads, continue straight ahead. The path becomes narrower. Head downhill and you’ll reach a T-junction.

(7) Continue to the right. At the fork, keep to the right and head uphill. 300 m further up, ignore the two paths in quick succession on your right. Enjoy an unobstructed view of the French Ardennes and the Ry d’Alyse valley. Walk to a fork.

(8) At the fork, after the open areas, turn left. Cross a track and continue along the path opposite, slightly veering to the right. A track joins you on the left; continue. Ford the Ruisseau de Broctay, which crosses the path. At the road, turn left, leaving the signposting behind.

No Markings

Cross the bridge and, in doing so, the border, and look for the path leading up the embankment at the entrance to the forest track on the right.

(9) Follow the path uphill and, at the top, turn right.

Yellow Line Markings

Walk along this path for 850 m, staying on the level at every junction or crossroads.

(10) Return to a wider path and continue to the left. At the muddy patch, ignore the hairpin bend to the right marked with a White Cross on a tree. Cross the Margut Stream. Then turn right, following a different route.

Blue Cycle Signposting

Leave the two paths on your left and, at the fork further on, head left. You’ll come out onto a track; head left and, a few steps further on, take the path on the right. Head downhill, leaving the markings behind.

No Signposting

(11) You’ll come across a building: it’s a winding tower from a former slate quarry. On your left, a small path leads to a picnic table. Walk past the foot of the building. You’ll reach the Ry d’Alyse and come across a brand-new footbridge. Cross it and climb up the embankment on the other side. You’ll end up on the path; turn left. At the fork, continue left.

Blue Cross markings

Take the path marked with a road sign reading “No entry except for forestry vehicles, cyclists, horse riders and local residents”. Go round the barrier and stay on the wide path. At the fork, turn left. Walk for two kilometres following the stream and pass the old entrance to the Oignies slate quarry. Further on, head out into the open and cross a small footbridge.

(12) Ignore the path leading under the trees, which is blocked by a barrier, and turn right. Follow the track until you reach another path. Turn left, then right.

(13) Walk uphill, ignoring the side paths, for 1.5 km. Cross the Ru de Delûve and, further on, join a wide forest track which you follow to the right. Walk until you reach a path on your right where the signposting changes.

Nordic markings 2 and 5

(14) Turn right and follow the path, continuing along the main track until you reach the road. Turn right. Ignore the markings and continue along the road to the crossroads and your car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 325 m - Car park at the forest entrance after the Rue de Revin campsite
  2. 1 : km 1.87 - alt. 329 m - Grid
  3. 2 : km 2.77 - alt. 378 m - Path after Tree 18
  4. 3 : km 3.08 - alt. 353 m - Ru
  5. 4 : km 3.41 - alt. 322 m - N990 road
  6. 5 : km 4.31 - alt. 365 m - Crossroads
  7. 6 : km 5.74 - alt. 328 m - Path on the right
  8. 7 : km 6.31 - alt. 231 m - T-junction
  9. 8 : km 7.36 - alt. 230 m - Y-junction after open areas
  10. 9 : km 7.98 - alt. 177 m - Path at the entrance to the forest track
  11. 10 : km 9.1 - alt. 214 m - Wide path
  12. 11 : km 9.85 - alt. 193 m - Building
  13. 12 : km 11.96 - alt. 234 m - Barrier on the forest track
  14. 13 : km 13.27 - alt. 358 m - Path on the right
  15. 14 : km 15.36 - alt. 375 m - Path on the right
  16. S/E : km 15.98 - alt. 325 m - Car park at the forest entrance after the Rue de Revin campsite

Notes

For this cross-border hike, it is best to use OSM or OSM Trails to view the paths once you reach the border, as the junction between the IGN France and Belgium maps is not detailed.

From (2) to (4), a track then path missing on OSM but clearly shown on IGN.

Picnic tables: at the house in the hamlet of Le Risque, just after (5), at (11).

From October to December, be aware of hunting dates on both the Belgian and French sides.

Muddy in places

No drinking water along the route

Exposed section – remember to protect yourself

Worth a visit

During
Sculpture marking the centre of the EU-15: Bernard Tirtiaux’s ‘Glass Cathedral’. Unveiled on 31 May 1996. Since January 2020, the geographical centre of the European Union has been located in the small Bavarian village of Gadheim, Germany. For the calculation, the I.G.N. takes into account all member states of the European Union, including their non-continental territories, overseas departments and islands.

Headframe of a former slate quarry.

Former slate quarry in Oignies, now a bat cave.

Ry d'Alyse, also known as Ru d'Alise or Ry d'Alisse: a stream forming the border between France and Belgium.

Nearby
Three Valleys Railway

Reviews and comments

4.4 / 5
Based on 6 reviews

Reliability of the description
4.3 / 5
Ease of following the route
4.3 / 5
Route interest
4.5 / 5
Pirenne
Pirenne

Overall rating : 5 / 5

Date of your route : Jul 26, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful route through woodland, following only paths and trails.

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23091950
23091950

Overall rating : 4 / 5

Date of your route : Aug 28, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

HELLO

HIKE ON 25 AUGUST 2024

EASY TO FOLLOW WITH A GPS
OTHERWISE, IT ISN’T OBVIOUS WHICH PATHS ARE MARKED AND WHICH ARE NOT.
BY THE WAY, WE MISSED THE CENTRE OF EUROPE MONUMENT

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Marco's
Marco's

Overall rating : 5 / 5

Date of your route : May 01, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A wonderful spot surrounded by nature and tranquillity, just 50 metres from the road. We were a bit worried because some people had mentioned an error in the distance (8 km), but the distance matched the description perfectly.

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lazzerini
lazzerini

Hello Corentin,
An 8km difference is quite a lot.
Doesn’t the route you have contain any detours or anomalies?

I’ve had feedback on other hikes like this before, but it’s often because the route hasn’t been cleaned up to remove all the GPS glitches...

Best regards

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Corantin
Corantin

Overall rating : 3.3 / 5

Date of your route : Feb 21, 2024
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

However, the route shown is much longer than 15 km; we covered over 23 km

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jphmon
jphmon

Overall rating : 4.3 / 5

Date of your route : Jan 06, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

After all these weeks of rain, you’d better have a good pair of hiking boots.
On the other hand, seeing the Alysse stream swollen and overflowing everywhere – wow, brilliant! The footbridge was barely passable.
A lovely hike, with two lovely climbs (:

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Ben 0562
Ben 0562

Overall rating : 4.7 / 5

Date of your route : Aug 26, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A superb hike, well-organised, with magnificent views – well done!
Just one small caveat... A word of warning for future users... just before point 9
“cross the bridge and, in doing so, the border, and look out for the path leading up the embankment (… on the left…) at the entrance to the forest track on the right! … in fact, there are two paths on the left and one on the right!
A huge thank you for the peace and quiet of this hike!

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