La Boule Bleue via the bamboo forest

Starting from the Fontenilles sports ground, this circular route takes you to the Lias radar station (Boule Bleue), with plenty of trails and undergrowth.

Details

4344653
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 13.33 km
  • ◔
    Average duration: 4h 15 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 146 m
  • ↘
    Descent: - 142 m

  • ▲
    Highest point: 304 m
  • ▼
    Lowest point: 204 m
  • ⚐ Country: France
  • ⚐ District: Fontenilles (31470)
  • ⚑
    Start/End: N 43.55669° / E 1.17832°
  • ❏
    IGN map(s): Ref. 2043ET, 2043O
  • Hour-by-hour weather

Photos

Description of the walk

(S/E) Leave the car park and head towards the roundabout. Before reaching it, cross the Route de Lias with caution (no pedestrian crossing) to take the D65, and continue towards the hamlet of Les Arramous.

(1) Leave the D65 and turn right towards the Grand Bois equestrian centre (Saint-Hubert). When the road ends, continue along the path that passes between the equestrian club's facilities. The path crosses the Grand Bois and, at the end of it, you will find yourself in the Gers. Continue along the path until you reach the tarmac road on Chemin de Grousset. Continue left on the road until you reach the junction with Chemin de Secouris.

(2) Turn left and climb gently towards the Lias radar station (la Boule Bleue). The road becomes increasingly rough, turning into a track as it crosses the Lartus woods, then becomes a road again at the edge of the woods.

(3) At the Pague junction, go straight ahead and climb towards the Chaü mill on the right-hand side of the road. La Boule Bleue begins to appear on the left; continue straight ahead to the foot of the tower topped with a blue radome concealing the civil aviation radar.

(4) Immediately afterwards, turn left onto the gas pipeline path.

(5) Follow the path into the woods opposite, while the main path descends to the right. After a while in the woods and a passage over the Crabères stream, rejoin the gas pipeline path in the open air and continue a little past the junction with the path leading to the Chaü mill.

(6) Take the path on the left into the woods and follow it until you reach the path leading to the mill. Shortly afterwards, the path bends: take the path on the right, cross the field and descend along the edge of the woods.

(7) The woods are L-shaped at this point: at the bottom of the L, take the path on the right that enters the woods. The path follows a stream and passes through relatively tall bamboo before emerging into the open air. The path continues uphill, following the edge of the woods on the left.

When the woods bend to the left, take the path on the right and follow the edge of the woods on the right-hand side until you reach the carriage road.

(8) Take this path and descend to the right. The descent is quite steep and the middle of the path is washed out when it rains. Descend until you see a gate on the left.

(9) Leave the path that continues downhill and take the shaded path on the right that leads to the D65 towards the hamlet of Les Arramous. Turn right and stay on the road until you reach the Haute-Garonne/Gers border.

(10) Leave the road and take the shaded path that leads to the Route de Lias after fording the Ruisseau des Crabères. Take the D37 on the left towards Fontenilles until you reach the entrance to the Lespèche industrial estate.

(11) Just before the industrial estate, take the shaded path on the right that runs along the outside of the first part of the industrial estate to the small stream at the end. Cross the stream using the carved steps and, at the top, turn left onto the path between the two parts of the industrial estate and head for the stadium car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 205 m - Sports ground car park
  2. 1 : km 0.88 - alt. 206 m - Fork to the right
  3. 2 : km 2.69 - alt. 214 m - Chemin de Secouris
  4. 3 : km 5 - alt. 293 m - Pague
  5. 4 : km 6.59 - alt. 303 m - La Boule Bleue
  6. 5 : km 7.17 - alt. 291 m - Entering the undergrowth
  7. 6 : km 7.88 - alt. 252 m - Bend towards the mill
  8. 7 : km 8.57 - alt. 257 m - Entrance to the bamboo forest
  9. 8 : km 9.03 - alt. 289 m - Chemin de Lartus
  10. 9 : km 10.04 - alt. 236 m - Gated entrance
  11. 10 : km 10.95 - alt. 214 m - Gers / Haute-Garonne border
  12. 11 : km 12.42 - alt. 209 m - Path running alongside the industrial zone
  13. S/E : km 13.33 - alt. 205 m - Sports ground car park

Notes

There are no water sources accessible during the walk.
Walking sticks may be useful in rough terrain.

Worth a visit

There are numerous viewpoints along the route, particularly on the slight incline before the mill, after the Boule Bleue and on the climb after the bamboo forest.

The route passes through numerous wooded areas; in season, you may spot mushrooms.

Reviews and comments

4.2 / 5
Based on 9 reviews

Reliability of the description
3.9 / 5
Ease of following the route
4.6 / 5
Route interest
4.2 / 5
User 9579154

Overall rating : 4 / 5

Date of your route : Mar 02, 2026
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

At point 5, the description really needs to be a little more precise.

5 Follow the path through the woods opposite, while the main path (gas pipeline) descends to the right. After a while in the woods and a passage over the Crabères stream, rejoin the gas pipeline path in the open air and continue a little further (30 metres) after the junction with the path leading to the Chaü mill.

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Poulet Hubert
Poulet Hubert

Overall rating : 5 / 5

Date of your route : Jul 21, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A discovery for Savoyard hikers staying in Samatan.
4.7

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User 11765299

Overall rating : 4.7 / 5

Date of your route : May 28, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely walk, without any difficulty and well described on Viso Rando. Thank you.

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AJT-31
AJT-31

Thank you for your kind comment.
I think the course of the stream fluctuates over time, but it is indeed the one to follow in the bamboo forest.

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Jacklecram
Jacklecram

Overall rating : 4 / 5

Date of your route : May 05, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A little too much tarmac for our liking at the start and end of this route. The rest of the hike is pleasant and shaded. We got a little lost around point 6 and had to improvise to get to 7, and ended up reaching the bamboo by chance. What an adventure
Thank you to everyone who creates these hikes.

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Patrick-
Patrick-

Overall rating : 4.3 / 5

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

A lovely walk with some beautiful views of the Pyrenees.

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hcrando
hcrando

Overall rating : 3.7 / 5

Date of your route : Nov 25, 2022
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely hike without any major difficulties. No problems following the description except at point 5 at the edge of the woods, where you have to follow the gas pipeline path on the left, which is not indicated in the description. Further on (point 6), the path you need to take is immediately after the junction with the road. One last point: the GPS track after the ford is incorrect. After the ford (point 10), there is only one clearly visible path to follow to the road, whereas the GPS indicates a non-existent path further on. The bamboo grove is particularly picturesque when you arrive in the sunshine, which was the case for us. Thank you to everyone who creates these hikes.

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JP3166
JP3166

Overall rating : 3.7 / 5

Date of your route : Jul 25, 2022
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hello,

The written description is vague and poorly documented, which means there is a definite risk of getting lost.
However, the GPS track is good and accurate. It is therefore safer to follow the track on your phone than to follow the written description.

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Yannick sanchidrian
Yannick sanchidrian

Same concerns!

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Yannick sanchidrian
Yannick sanchidrian
• Edited:

Overall rating : 4.3 / 5

Date of your route : Apr 18, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

Many unclear passages, quite a few horses on the first part of the walk. Be careful, lots of TAR.

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RME
RME

Overall rating : 4.3 / 5

Date of your route : Mar 28, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hello, the circular Blue Loop hike through Bamboo Forest is very pleasant and accessible to all.
We would like to point out the lack of landmarks between points 5 and 11.
During the descent into the woods at point 5 and the climb back up to point 6, there are no landmarks, and on the path leading up to the mill, I couldn't find the trail that crosses the woods to point 7.

This route must be pleasant in summer for crossing the various woods, despite the tarmac at the start of the hike.

Enjoy your walk, everyone!

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