The Jardin d'O, the woods of Nismes and a few geological curiosities

Set off to explore the pretty town of Nismes with its beautiful stone houses and unspoilt nature. Follow the Eau Noire river upstream to Petigny, climb its wooded hills and discover the Fondry des Chiens via less frequented paths, ending your hike with a visit to the Jardin d'O.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 13.07 km
  • ◔
    Average duration: 4h 40 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 327 m
  • ↘
    Descent: - 319 m

  • ▲
    Highest point: 305 m
  • ▼
    Lowest point: 154 m

Photos

Description of the walk

Parking at Place de Châtillon.

(S/E) With your back to the Eau Noire, take the alleyway that starts between numbers 3 and 5. When you reach a white house, turn left and climb a few steps to pass in front of a house. Join a stony path that climbs into the forest and continues along the hillside (Nismes arboretum route). You will reach a crossroads.

(1) Continue straight ahead and you will soon reach a bench. The path takes a sharp right turn, climbs and joins a wide forest path. Follow it to the left and you will reach a gravel path on the right. Continue straight ahead until you reach a road, Rue du Calvaire, and follow it to the left and downhill.

(2) At the intersection, turn sharply right. At the end of the tarmac road, continue along a path that soon becomes a trail. Walk along the Eau Noire on your left.

(3) You will come to a road; follow it to the left and cross the Eau Noire river via the Pont du Bâti bridge. Follow the main street, Place du Bâti. You will reach the N99; follow it to the left to reach a pedestrian crossing. Cross the N99carefully and follow a small street opposite, between numbers 122 and 124. You will come out onto Place Saint-Victor.

(4) Head left and walk past the church entrance porch. Continue along Rue Chéreulle. At the fork after about 100 metres, turn right onto a small sloping street. After about 50 metres, turn left onto a path. Go uphill, passing a path on the left and then three paths on the right.

(5) At the T-junction, turn left (do not go downhill). At the next junctions, keep left. The path gives way to a stony track, which then gives way to a street. At the end, turn right onto Rue des Roches. Continue straight ahead and enter the woods via a clearly marked uphill path. Stay on the main path and pass a boundary marker. Follow a path through a cutting and you will reach an intersection.

(6) Then turn onto the path on the left. You will come to a road, Rue des Genêts, and follow it to the left and downhill. After about 150 m, take a path on the right. After a steep descent and a marked ascent, you will come to a T-junction.

(7) Turn right and climb. At the next junction, turn left. Continue straight ahead, descend slightly, cross a stream and climb up the other side. Continue straight ahead to the Roche Trouée bivouac site.

(8) Turn left and, at the fork that appears immediately, keep left. Join a wide path and follow it to the left. Continue straight ahead (north-west) and pass in front of a chapel. When you reach a gravel path, keep left and continue downhill. Join Rue Regniessart, follow it to the right, cross Rue des Genêts on the left-hand side and continue to No. 99.

(9) Cross the road carefully and follow it to the right on a parallel grassy strip. At the "Roche Trouée" sign, turn left, go through a gate and immediately follow a steep path to the right. Walk along a fence, leave a path on the right and descend to a new gate. Continue straight ahead and reach the bottom of the valley. Then follow a path on the right and reach a gate in the fence that marks the boundary of the Fondrys des Chiens site.

(10) Follow the path to the left and walk across a dry meadow (also known as a calcicolous meadow, formerly grazed by sheep). The path climbs twice and reaches another gate: go through it and continue to the left. Join a path and follow it uphill to the right.

(11) Before the top of the hill, turn left onto a path that leads into the woods (look carefully for this turn-off). Walk through a sort of tunnel of vegetation. You will come out at a circular turning loop for the Nismes tourist train. Immediately after, take a road that climbs to the right, Rue Roche-Nanette. Follow it to the end (ignore a road on the right).

(12) At the end of the tarmac road, turn left onto a path that goes around an isolated house. After several bends, the path leads to Rue Orgeveau. Follow this road to the right and climb up towards Fondry des Chiens. At the next intersection, take the road that climbs up to the left. Pass a path on the right and you will soon reach a crossroads.

(13) Take thefirst path on the left, which runs alongside a wood on the left and a wooded meadow on the right. Further on, enter the wood and descend. At the end of the path, go down a staircase, which leads to Rue des Juifs. Follow this road to the right. Walk past the imposing Maison Communale de Nismes on your left.

(14) Then take a path on the left that descends towards the Jardin d'O. You will soon reach a wider path and follow it to the right until you reach the cemetery. Then turn sharply left and descend towards the edge of the lake, passing by the waterfalls. Go around the lake on the left and then walk along a river on your right. Pass the mini golf course and exit the park. Turn right to cross the Eau Noire. At the end of the bridge (church on the right), turn left into Rue de la Vieille Église. Just after the Tourist Office, turn left into an alleyway, cross a branch of the river and head for the car park at Place de Châtillon (S/E).

Waypoints

  1. S/E : km 0 - alt. 155 m - Parking at Place de Châtillon - Eau Noire (rivière) - Belgique
  2. 1 : km 0.41 - alt. 190 m - Crossroads
  3. 2 : km 1.34 - alt. 166 m - Intersection
  4. 3 : km 3.09 - alt. 164 m - Pont du Bâti
  5. 4 : km 3.43 - alt. 169 m - Église Saint-Victor (Petigny)
  6. 5 : km 3.99 - alt. 210 m - T-junction
  7. 6 : km 5.22 - alt. 287 m - Intersection
  8. 7 : km 6.22 - alt. 260 m - T-junction
  9. 8 : km 7.27 - alt. 295 m - Spot bivouac - Roche
  10. 9 : km 8.56 - alt. 193 m - Route N99
  11. 10 : km 9.4 - alt. 200 m - Portico - Le Fondry des Chiens
  12. 11 : km 9.73 - alt. 218 m - Small path on the left
  13. 12 : km 10.43 - alt. 201 m - Trail start
  14. 13 : km 11.06 - alt. 211 m - Path and trail to the left
  15. 14 : km 11.92 - alt. 171 m - Path to the Jardin d'O
  16. S/E : km 13.07 - alt. 156 m - Parking at Place de Châtillon

Notes

Several benches and/or picnic areas - Place de Châtillon, (1 and 2), Bivouac de la Roche Trouée, RN99, and on the Jardin d'O site.
If the ground is wet, bring walking sticks.

Please note that there is a market on Place de Châtillon every fortnight. Check the Tourist Office website for hunting dates.

Worth a visit

The Jardin d'O, the resurgence of the Eau Noire Rue d'Avignon, the old count's castle, the old cemetery and its defensive wall, Le Fondry des Chiens.
In Mariembourg and Treignes, the Three Valleys Steam Railway, numerous museums in Treignes, etc.

Reviews and comments

4.6 / 5
Based on 7 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.6 / 5
Route interest
4.6 / 5
Pirenne
Pirenne

Overall rating : 5 / 5

Date of your route : Feb 07, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A delightful walk, the arboretum is particularly interesting for children and best visited in summer...
There is obvious geological interest with the Trou du Diable (Devil's Hole) and the Fondry des Chiens (Dog's Pond).
Pretty landscape of calcareous grasslands.

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pierre gobin
pierre gobin

Hello, thank you for posting your comments about this hike. I think you are being a little harsh in your criticism of the carriage roads and paved sections. They account for less than a quarter of the total distance of the hike, which passes through two villages. As for the carriage roads, I prefer to call them stone-paved roads. They are used by farmers and foresters, and it was along these roads that the wood used to make clogs was brought down to the village. They are part of the history and soul of this region. I agree with your criticism of the large amount of rubbish that, I regret to say, litters the side of the N99, as well as the fairly heavy traffic and excessive speed of vehicles, but this section is only 400 metres long and the verges are wide. It is, after all, a necessary passage for which there is no alternative, as evidenced by the fact that the GR also uses it in the "Grande traversée de la forêt de Chimay" (Great Crossing of the Chimay Forest). You believe that there are no viewpoints, which is your opinion and I respect it, but I am surprised, as you are the only person to make this criticism. Admittedly, we are not in the mountains, but there are still views of the Eau Noire valleys. Sometimes you have to take the trouble to turn around to discover the landscapes you are leaving behind.
I am sincerely disappointed that I was unable to help you appreciate my hike, but as you so rightly say, this is a personal opinion and I respect it as such.

Kind regards

P. Gobin

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GuyLeroy
GuyLeroy
• Edited:

Overall rating : 3.7 / 5

Date of your route : Apr 12, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★☆☆☆ Disappointing
Very busy route : No

The route is very easy to follow with the app. However, I won't be doing this route again. In my opinion, there are far too many sections of carriage roads and tarmac roads (including a busy national road with rubbish on the hard shoulder). There are no viewpoints, which is a shame. We found the hike a bit monotonous (personal opinion).

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Arina Tomberg
Arina Tomberg

Overall rating : 5 / 5

Date of your route : Apr 03, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent walk around Nismes. The beauty of springtime nature enchants you with every step. The route is dotted with truly fascinating geological, natural and historical curiosities. Not to be missed!

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Thomast
Thomast

Overall rating : 4.7 / 5

Date of your route : Nov 23, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very nice trip! It was necessary to have the app turned on and stay connected because the roadbook would not have been sufficient given the complexity of the junctions.

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danielmatot
danielmatot

OK
Thank you
Have a nice day

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pierre gobin
pierre gobin

Hello, no, the route is not marked. There are several markings, such as those for the GR (long-distance footpath) and other marked trails under the auspices of the tourist office, but as this hike aims to highlight several points of interest, it would be difficult, if not unclear, to mention them all.
You can obtain a map of the region's hiking trails from the tourist office located near the car park and starting point, or order it online.
In principle, the hiking map and description should be sufficient. I have not yet received any negative comments about the ease of following the route. The ideal solution, in my opinion, is to track your progress on your smartphone using the Visorando app. One last piece of advice for this season: consult the hunting schedule, which you will find on the Viroinval municipal website. Have fun!

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danielmatot
danielmatot

Hello
I would like to know if all these routes are signposted or if we need to use a map
Thank you

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pierre gobin
pierre gobin
• Edited:

Hello, thank you for your comments. You are not the first to report this difficulty. I myself had some trouble finding it when I first scouted the hike, and that was in early autumn. I try to look for these somewhat "hidden" trails on each of my hikes.
Your comment will certainly help other hikers. Thank you.

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dominique courtois
dominique courtois

Overall rating : 5 / 5

Date of your route : May 14, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

To find the path through the tall grass, after the church, keep to the left of the road.

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Légat Christine
Légat Christine

Overall rating : 4.3 / 5

Date of your route : Jun 13, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very nice walk in a beautiful area with stunning scenery. The only difficulty was finding the "path" just after passing the church on the right, as it was well hidden by a tangle of weeds.

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Chantalgryson0206
Chantalgryson0206

Overall rating : 4.3 / 5

Date of your route : Mar 07, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

I loved these rolling landscapes. A very varied walk. Magnificent! Thank you.

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