Illau Cabin and Isard Chapel

Torrential streams, forests, mountain pastures, panoramic views, huts and chapels await you on this hike at the bottom of the Biros valley.

Details

2029000
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 14.08 km
  • ◔
    Average duration: 6h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 798 m
  • ↘
    Descent: - 800 m

  • ▲
    Highest point: 1,485 m
  • ▼
    Lowest point: 798 m

Photos

Description of the walk

Car park near Castéra.

(S/E) The trail starts above the car park, passes above the hamlet of Frechendech and then follows the Torrent de l'Isard. It passes by barns that have been restored to varying degrees, and the hamlet of La Peyre, which has been very well restored. Cross the Ruisseau de Labor.

(1) At the fork, the trail (GRP® marked in red and yellow) continues to the left, slightly above the stream, before crossing it via a footbridge. The trail then begins to climb with a hairpin bend to the right.

(2) The trail passes in front of the Escudié fountain. Continue along the Isard.

(3) At the Passerelle des Pichès footbridge (which you will cross on the way back), continue along the same bank on the path that climbs gradually. Just before leaving the forest, follow the yellow + red and yellow markings carefully, as there are several paths due to the water. At the fork (altitude 1399m), turn right.

(4) When you reach the summer pasture, at the wooden sign, continue left towards the bottom of the valley. The path climbs and arrives at the Cabane d'Illau.

(5) This is a good place to take a break before heading back. Retrace your steps to the crossroads with the wooden sign.

(4) Turn left (GRP®) and ford the Ruisseau de l'Araing stream (no bridge). Continue along this path, which more or less follows the contour lines and takes you to the other side of the valley.

(6) Cross the Isard on the bridge (Cabane Forestière de l'Isard a little above on the left), the path turns right and continues following the Torrent de l'Isard.

(7) In an open area with the Chapelle de l'Isard chapel, continue along the path, which initially zigzags downhill to reach the Passerelle des Pichès footbridge.

(3) Cross the footbridge and take the path on the left, then return via the same route you took to the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 802 m - Car park
  2. 1 : km 1.3 - alt. 876 m - Common fork in the road for both directions.
  3. 2 : km 2.73 - alt. 1,005 m - Escudié fountain.
  4. 3 : km 3.59 - alt. 1,102 m - Common fork in the road for both directions. - Passerelle des Piches
  5. 4 : km 6.11 - alt. 1,400 m - Common fork in the road for both directions. Springs.
  6. 5 : km 6.56 - alt. 1,485 m - Illau Cabin - Cabanne d'Illau
  7. 6 : km 8.34 - alt. 1,373 m - Bridge on the right. Isard Forest Cabin.
  8. 7 : km 8.91 - alt. 1,331 m - Chapelle de l'Isard
  9. S/E : km 14.08 - alt. 805 m - Car park

Notes

(4) On the way back: there is no bridge over the Araing, so you will have to ford the river (all other river crossings have bridges).

Cabane d'Illau, Cabane forestière de l'Isard
At the Isard Chapel, there is a refuge area with a fireplace and solar-powered electricity, as well as a spring just in front.
Toilets at the car park (if open) and a few picnic tables.
Panoramic view at the Cabane d'Illau.

Yellow markings throughout the circuit (in addition toGRP® markings)

Worth a visit

From the Cabane d'Illau at 1,485 m, following theGRP®, you can go to the Étang d'Araing and the Refuge Jacques Husson at 1,965 m (or Refuge de l'Étang d'Arraing).

Reviews and comments

4.8 / 5
Based on 17 reviews

Reliability of the description
4.9 / 5
Ease of following the route
4.9 / 5
Route interest
4.7 / 5
Djudju Smile
Djudju Smile

Overall rating : 5 / 5

Date of your route : Sep 14, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very pleasant hike under the canopy of trees. When I arrived at the Illau hut, I decided to push on further to reach the Arraing lake, which took me a good hour but was well worth it!
The descent was easy.
Hike completed on Sunday 14 September, trail very wet and slippery in places.

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User 7319579

Overall rating : 5 / 5

Date of your route : Aug 25, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A superb walk, most of the route through cool woods.
Then you arrive at the cabin and are treated to a 360° view of the mountains.
Definitely worth doing and suitable for all levels.

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User 20349333

Overall rating : 5 / 5

Date of your route : Jun 02, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very beautiful hike with excellent signage.

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Paillole
Paillole

Overall rating : 5 / 5

Date of your route : Aug 26, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very beautiful hike, almost entirely through forest, which is pleasant when it's hot.
I recommend that the more motivated hikers climb up to the Araing lake from the Illau hut. It takes about half an hour of climbing, but it's well worth the effort.
After a welcome break, the descent is gentle, passing by the Isard chapel.
I found the path a little too busy for my liking, but then again, it was the end of August.

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leosyi
leosyi

Overall rating : 4.7 / 5

Date of your route : Jun 24, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

Hello, the description is good and leaves no room for misunderstanding; you know at all times that you are on the right track. We crossed paths with or passed about ten other hikers. Magnificent panoramas, peaceful hike.

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PATRICE31800
PATRICE31800

Overall rating : 4.7 / 5

Date of your route : Aug 31, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hello, everyone.
A beautiful hike, mostly in the forest. The route is as described. We saw bear paw prints in several places, which surprised us but didn't worry us. The snack break at the Illau hut was very welcome. Then we returned via the Isard chapel, which was open and which we were able to visit and see the restoration work. A beautiful route with stunning views. Thank you for sharing.

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Dominique Gente
Dominique Gente

Overall rating : 5 / 5

Date of your route : Aug 06, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant hike, without any major difficulties. Highly recommended

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Robert Darmana
Robert Darmana

Overall rating : 5 / 5

Date of your route : Jun 23, 2023
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 airy woodland, with a mix of coniferous and deciduous trees. The path is fairly even and easy to walk on, with a generally steady gradient. The chapel has been restored and can be visited on Thursdays thanks to a team of volunteers from the surrounding villages. The roof is new and the interior has also been restored. One stained-glass window has been completed and two more are on the way. A spacious refuge with six beds is located under the chapel, with a large fireplace, water and toilets. The Illau cabin is located in an open summer pasture with a beautiful view. It is well maintained and has beds under the eaves. A very beautiful spot on the way to the Arraing pond, 1 hour and 15 minutes away.

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Angelique Stoll
Angelique Stoll

Overall rating : 5 / 5

Date of your route : Jun 18, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Magnificent hike.
You don't really notice the elevation gain.
We cut the hike short because of the weather.
We went straight to the chapel.
There are signs with directions along the way.
Once you arrive at the chapel, the view is incredible.
You won't want to leave.
Easily accessible for a first hike and for children who are good walkers.

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seco25
seco25
• Edited:

Overall rating : 5 / 5

Date of your route : Apr 27, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

great hike, but be prepared to wade across the river barefoot at this time of year!

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badmington
badmington

Overall rating : 5 / 5

Date of your route : May 23, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very beautiful hike, but the starting point car park is not easy to find.

well marked, but the signs indicating the locations need updating.

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ggomez
ggomez

Overall rating : 4.7 / 5

Date of your route : Oct 18, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A very pleasant route, mostly through forest.

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Mado.R
Mado.R

Overall rating : 4.7 / 5

Date of your route : Jun 30, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful hike with no particular difficulties
Due to a heavy storm the day before, some sections were slippery.
Instead of climbing to point 4 as indicated in the description, we took (two-thirds of the way up) a path on the right indicated on the IGN map to see the cold fountains.
At the Illau hut, we were able to admire the view.
we made a quick return due to threatening clouds.

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Mic
Mic

Overall rating : 5 / 5

Date of your route : May 23, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Great hike, it was drizzling that day but as 85% of the trail is in the woods, it was really great

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KATROG
KATROG

Overall rating : 4.3 / 5

Date of your route : Oct 14, 2019
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good

Hello,
A very beautiful hike with varied, stunning scenery.
Very easy route: no difficulties.

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