Slag heap 107, the large clock tower

A route that will take you to the summit of slag heap 107, a fully wooded slag heap. You will follow old mining sidings, which are former railway tracks. You will walk alongside ponds with a bucolic charm, then cross through wild woods or farm tracks with unobstructed views.

Details

1975480
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 6.30 km
  • ◔
    Average duration: 2h 00 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 68 m
  • ↘
    Descent: - 69 m

  • ▲
    Highest point: 89 m
  • ▼
    Lowest point: 20 m

Photos

Description of the walk

Park in the car park at the Carvin leisure centre.

(S/E) Go through the barrier and enter the centre via the path furthest north from the car park. Look out for a noticeboard listing the names of the children and the trees planted in their honour.
Walk on until you reach the junction with the straight path.

(1) Turn left onto it until you reach the tarmac road. Turn right, taking a hairpin bend.
Stay on this path, which remains straight; first cross the fields, then gradually you’ll return to a more wooded area.
Enter the woods and reach a crossroads of paths.

(2) Follow the GRP® to the left until you reach the foot of the slag heap.

(3) Start the climb up the slag heap via a small path on the left. Clearly visible at first, the path gradually disappears. Hold on tight as some sections are quite steep before reaching the summit.
Head back down the same path.

(3) Continue to the left. Walk around the slag heap anti-clockwise to reach another junction.

(4) Take the path on the right, a wide, flat path that gradually emerges from the wooded area
Rejoin Rue du Puits, passing by the old entrance to pit no. 12.
Turn right, take Rue du Puits, then turn right onto Rue du Pont de Grès.
Turn left onto Rue du Tour d'Horloge.
Walk up the street; you will see the gates of an SNCF centre on your right.

(5) Head towards these gates; the path you need to take is just to the right of the gates.
It heads off to the right and leads into the woods. It winds its way through the woods, sometimes giving you the impression you’re going round in circles, but don’t worry, this is the original route.
Follow this path for a while until you reach an open area near the slag heap.

(6) Turn left onto the wider path and quickly head right. Join an even wider, straight path that crosses the wooded area to reach a large junction near the ponds.

(7) Head right and cross a small bridge. You’ll come to the subsidence ponds caused by mining; walk alongside them. The pond is on your left. Cross the small bridges amongst the anglers to return to the car park where you started (S/E).

Waypoints

  1. S/E : km 0 - alt. 21 m - Carvin Leisure Centre car park
  2. 1 : km 0.1 - alt. 21 m - Towards the countryside
  3. 2 : km 1.3 - alt. 22 m - GRP
  4. 3 : km 1.95 - alt. 54 m - Crossroads on the climb up the slag heap
  5. 4 : km 2.84 - alt. 28 m - Exit from the woods
  6. 5 : km 3.68 - alt. 24 m - Intersection of street and woodland
  7. 6 : km 5.02 - alt. 24 m - Return along the straight paths
  8. 7 : km 5.76 - alt. 21 m - Towards the ponds
  9. S/E : km 6.3 - alt. 21 m - Carvin Leisure Centre car park

Notes

Option to shorten the walk at point (4) to head straight to point (6)

You are in protected areas, listed as UNESCO World Heritage Sites; please take your rubbish with you, observe but do not disturb the flora and fauna so characteristic of the mining basin.

Bring your binoculars and camera for the viewpoints.

You are in a historic place; respect the memory of the past and discover its traces.

Worth a visit

If you want to join the UNESCO Slope Challenge (51 slopes to climb) or just for fun, you can take a selfie at the top of the slag heap and share it with #terrilmania and @terrilmania on Instagram or by email at defiterril@gmail.com.

You can also add your stone to the cairn (pile of stones) at the top of the slag heap and leave a lasting mark of your visit to the summit.

Reviews and comments

3.7 / 5
Based on 10 reviews

Reliability of the description
4 / 5
Ease of following the route
3.4 / 5
Route interest
3.7 / 5
Michel D2.
Michel D2.

Overall rating : 3.7 / 5

Date of your route : Apr 20, 2026
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

From point 5 onwards, there has been some construction work; the route is likely to be altered

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McWall
McWall

Overall rating : 4.3 / 5

Date of your route : Feb 24, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

It’s tricky to take the first turn-off. A new housing development blocks the start of the path.
There are numerous flooded sections, but fortunately they are easy to get round

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guytout
guytout

Overall rating : 3 / 5

Date of your route : Dec 19, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : No

Noisy TGV and motorway route
roads going in all directions, making it difficult to find your way

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Sandetfred
Sandetfred

Overall rating : 4.3 / 5

Date of your route : Dec 18, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A walk with a bit of an incline; the slag heap is nice, but otherwise the path is very muddy, or even waterlogged, in December.

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guytout
guytout

Overall rating : 3.3 / 5

Date of your route : Sep 25, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : No

A fairly steep climb up the slag heap, with noise from the A1 motorway and the TGV

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mosaic
mosaic

Overall rating : 4.7 / 5

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

There is little signposting on the slag heap, with several possible routes. Please take care: the path can be slippery in wet weather and is steep in places.

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Fréd&Chrius
Fréd&Chrius

Overall rating : 3.7 / 5

Date of your route : Sep 20, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

A lovely route with lots of paths criss-crossing in all directions
6.8 km in 1 hour 25 minutes. We strayed from the route twice but didn’t go far off course.
Easy hike, except for the slag heap section, which you can climb via small, unmarked paths with some very steep sections requiring good shoes with studs.
Waze doesn’t take you to the car park but to a nearby housing estate with parking spaces

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mhasse
mhasse

I don’t mean to nitpick, but it’s impossible to check whether the map’s route matches the actual terrain, as there are paths everywhere and in every direction!

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henri57
henri57 ★

Hello,

Thank you for taking the time to give your feedback.

For your information, ‘Route on map’ refers to assessing whether the route shown on the map matches the actual terrain.

It’s just a bit better with the phone app for finding the right direction.

So the route is correct

See you soon

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mhasse
mhasse

Overall rating : 2.5 / 5

Date of your route : Jun 14, 2020
Reliability of the description : Not used / Not applicable
Ease of following the route : ★☆☆☆☆ Very disappointing
Route interest : ★★★★☆ Good
Very busy route : No

It’s impossible to follow the route suggested on the Visiorando page – mountain bikers have created tracks everywhere! It’s impossible to find your way...
It’s just a bit easier with the app on your phone to help you find the right way.
It’s still a beautiful, very steep route to do in dry weather

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RANDO5962
RANDO5962

Overall rating : 3.7 / 5

Date of your route : Aug 10, 2019
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★☆☆ Average

Here are a few disappointments about this hike:

- To get to the start, I used the app’s Waze feature, which directed me to Rue des Oiseaux (at the tip between points 1 and 2 on the map). Fortunately, it’s easy to park in this new housing estate.

- It’s not always easy to choose the right path on the slag heap. Thankfully, there’s the app’s map and GPS.

- The climb up the slag heap is indeed very steep, making the descent quite technical (good grip footwear essential), so it’s best done when the ground is dry. I was disappointed because the view isn’t 360 degrees like on some slag heaps. I felt I’d put in a lot of effort and wasn’t fully rewarded at the top.

- Finally, on the way back, just after point 7, when I tried to cross the bridge over the lake, the vegetation was blocking the path immediately after. Given the previous points, I didn’t persist and cut across to the car.

In conclusion, a hike worth doing for the physical challenge but much less so for the views, which wasn’t my main aim. Need to review the Waze directions to the start and check the footbridge crossing after point 7.

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Chris593012
Chris593012

Overall rating : 3.3 / 5

Date of your route : Aug 04, 2019
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good

The description was disappointing as there are so many possible routes – paths created over time by various hikers and mountain bikers. As a result, getting to the top of the slag heap was tricky. A shame. Luckily, I had the route marked on the map combined with my phone’s GPS.
On the plus side, I hadn’t known about this place before, and it’s well worth a visit.

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