The Val de Sirod and the Pertes de l’Ain

Ten minutes from Champagnole, the most powerful of the medieval fortresses still stood not so long ago... A nature and heritage walk awaits you through the Val de Sirod around the site of the Perte de l'Ain, which is at the end of this route. You will pass by the Château Villain fortress, viewpoints, the Rocher des Commères, the castle chapel, the Fontaine des Tufs, the Roche des Sarrasins, the village of Syam, and more.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 10.13 mi
  • ◔
    Average duration: 6h 05 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,627 ft
  • ↘
    Descent: - 1,617 ft

  • ▲
    Highest point: 2,612 ft
  • ▼
    Lowest point: 1,752 ft

Description of the walk

Start from the car park at the entrance to the village of Bourg-de-Sirod, next to the town hall.

(S/E) In the car park, at the signpost, follow signs for Nozeroy and walk up the path to the fortified gate of Richebourg. This is one of the old salt roads where convoys on their way to Switzerland would pay the salt tax.

(1) After the fortified gate, at the signpost, follow the sign for Nozeroy to the left along the path that climbs. At the signpost for Les Roches Graviers, continue straight on towards Nozeroy along the ridge until you reach the ruins of Château Villain.

(2) Continue along the ridge on a pleasant path until you reach a fork where the slope levels off.

(3) Turn right and follow the path to the road. At the sign for ‘Nozeroy’, walk 200 metres to the right until you reach a hairpin bend to the left. Look out for the signpost marked ‘aux Combes’.
(4) Turn right towards “Escalier des Coucous”, then quickly take a path across the field to the left which runs alongside the track. Follow the edge of the field on your right until the end. Climb over the fence using the rock for support, then walk a few metres to the left to the viewpoint.
Then retrace your steps back to the rock and take the path straight ahead. Head downhill to reach the Escalier des Coucous.

(5) At the bottom of the steps, turn left (there is currently no signpost for ‘Rocher des Commères’). Pass between large boulders through vegetation that changes frequently.

(6) At the Rocher des Commères, continue along the path as it descends. Pass through a coniferous forest, then a field, and arrive at a junction with a road. Take the small path opposite which leads downhill and reach the fork with a signpost.

(7) Carry on to the right, towards Nozeroy, until you reach the castle chapel via Rue les Chaffaux.

(8) Continue along the path towards Nozeroy for 100 metres and turn left at the signpost marked ‘Richebourg’. Follow the sign for ‘Sous le Mou’, walk for 300 metres and, at the signpost marked ‘Sous le Mou’, turn left towards ‘les Tufs’.
At the cross-path, overlooking the River Ain, turn left. Cross the bridge over the River Ain (EDF structure) and head for the Source des Tufs.

(9) Continue along the path and, at the next junction, at the signpost marked “les Tufs”, turn left towards “Côte Poire”. When you reach the tarmac road, ignore it and carry on along the path to the left. This path goes round the ridge of Côte Poire and comes back down the other side of the slope. At the three-way junction, go right and reach the junction with the signpost marked “Côte Poire”.

(10) Take the path on the left, towards “Syam”. You’ll reach a hairpin bend in the road. Ignore the road and take the path on the right. This leads to the Roche des Sarrasins.

(11) Pass between the two boulders and continue along the path to the road. Follow it to the right and enter the village of Syam. Reach the fork, just after the church, with a fountain in the centre.

(12) Turn left onto Rue du Lavoir, which runs alongside the church. At the next junction, turn right and head down to the crossroad at the bottom. Turn right, quickly ignore a road on the left and find a path on the left just past the house. Follow this path, which begins with a flight of steps, and climb up to the Chapel of Notre-Dame de la Paix.

(13) Continue downhill along the path next to the chapel and join Rue des Scilles. Turn right until you reach the D127 (Rue des Sarrazins) and turn left onto it.

(14) After the local girls’ school, continue along the path to the right, following it for about 3 km until you reach the signpost for “Les Forges”. With the River Ain on your left, walk along it there and back to the bridge to admire the scenery.
Back at the “Les Forges” signpost, follow the sign for “Perte de l’Ain, 200 m” to the left. Continue to the next fork in the path.

(15) Turn left for a round trip to reach the Perte de l’Ain. Retrace your steps.

(15) On your return, follow the sign for “La Passerelle” to the left and cross the River Ain.

(16) Carry on and, further on, at the signpost marked ‘Côte du Martinet’, turn left towards ‘Bourg de Sirod’ and reach the Chambre d’Eau. The water is channelled to supply a hydroelectric power station.

(17) Continue along the path and head for the town hall on the right (S/E).

Waypoints

  1. S/E : mi 0 - alt. 1,923 ft - Car park at the village entrance (‘town hall’)
  2. 1 : mi 0.18 - alt. 2,057 ft - Richebourg Fortified Gate
  3. 2 : mi 0.68 - alt. 2,329 ft - Villain Castle
  4. 3 : mi 1.34 - alt. 2,612 ft - Path junction
  5. 4 : mi 1.74 - alt. 2,562 ft - Junction of road and path ‘Signpost’
  6. 5 : mi 2.09 - alt. 2,411 ft - Bottom of the Coucous Stairs
  7. 6 : mi 2.35 - alt. 2,188 ft - Rocher des Commères
  8. 7 : mi 2.73 - alt. 2,005 ft - Junction with the road ‘signpost’
  9. 8 : mi 3.24 - alt. 2,133 ft - Castle chapel
  10. 9 : mi 3.99 - alt. 1,903 ft - Fontaine des Tufs (Bourg-de-Sirod)
  11. 10 : mi 6.11 - alt. 2,382 ft - Junction
  12. 11 : mi 6.73 - alt. 2,021 ft - Roche des Sarrasins (Syam)
  13. 12 : mi 6.96 - alt. 1,844 ft - Village of Syam
  14. 13 : mi 7.24 - alt. 1,900 ft - Chapelle Notre-Dame de la Paix (Syam)
  15. 14 : mi 7.55 - alt. 1,795 ft - Local girls’ school
  16. 15 : mi 9.57 - alt. 1,860 ft - Perte de l'Ain
  17. 16 : mi 9.74 - alt. 1,818 ft - Footbridge - Ain (rivière)
  18. 17 : mi 9.9 - alt. 1,916 ft - Water chamber
  19. S/E : mi 10.13 - alt. 1,923 ft - Car park at the village entrance (“town hall”)

Notes

(1) You can reach the upper part of the fortified gate via the small path on the left as you climb. Exhibitions are sometimes held there.

Worth a visit

Ruins of Villain Castle: This was built by Simon II of Commercy at the end of the 12th century, measuring 200 metres long and 34 metres wide. After numerous wars of conquest by the Kingdom of France, it was between 1808 and 1810 that the castle suffered a final, fatal assault. It was used as a stone quarry for the reconstruction of the Bourg-de-Sirod forges, which had burnt down.”

Reviews and comments

4.6 / 5
Based on 13 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.2 / 5
Route interest
4.9 / 5
saint-apollinaire
saint-apollinaire

Overall rating : 5 / 5

Date of your route : Jul 05, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A shortened walk, setting off from the town hall, then heading towards 9 via 1, and continuing on to the end (around 10 km).
A lovely walk, with a pleasant temperature of 28 degrees despite the heatwave.
Picnic tables in the shade at the start.
A beautiful, very diverse forest.
Of interest for those interested in the ‘pertes de l’Ain’.

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billbock
billbock

Overall rating : 5 / 5

Date of your route : May 11, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A wonderful hike with two fairly long stretches along the Poire coast and then on to Syam

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Gp&Pmn
Gp&Pmn

Overall rating : 4 / 5

Date of your route : May 15, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

Please note that some fences may disrupt your journey. No issues with the Visorando app on your phone.

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NOLLICEC
NOLLICEC

Overall rating : 5 / 5

Date of your route : Sep 13, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

The first part of the route (points 1 to 9) is identical to that of the "rochers de commères" (gossip rocks), which we had already done a few days ago. The Ain waterfall is magnificent from point 9 (view from above), then there is a long, gentle climb to point 10, followed by a rapid descent to Syam (caution: slippery in wet weather). No visitors due to very changeable weather (rain/sun). Return to the Ain sinkhole (view from below) with a beautiful waterfall.

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bisontin
bisontin

Overall rating : 4.7 / 5

Date of your route : Jul 31, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Very beautiful hike.

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Rentrotter
Rentrotter

Overall rating : 4.7 / 5

Date of your route : Jul 02, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Superb hike, very well maintained in slightly tricky areas, such as the Coucous stairs, in rainy weather and on slippery ground. The slightly more monotonous sections are quickly compensated for by more technical sections, and the Ain river rapids at the end are truly magnificent. This area is a little busier, but the village of Syam is also very pleasant. Take a short detour to the Palladian villa and its park.
Thanks to the author for sharing this beautiful route.

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Libelleule 70
Libelleule 70
• Edited:

Very beautiful parish-specific to Brittany hike - magnificent panorama - small trails that are sometimes a bit technical - I got a little lost at the point (10) - didn't find the Roche des Sarrazins but rejoined the trail by zigzagging through the forest to the road to Syam -braov

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Michel lacroix
Michel lacroix

Overall rating : 4.7 / 5

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

Superb hike with stunning views and interesting geological features. At point 11, after passing between the two rocks, the descent towards the road leading to Syam is a little tricky.
High traffic only in the vicinity of the car parks.
Highly recommended.
Well done to the author.

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YAO
YAO

Overall rating : 4.3 / 5

Date of your route : Apr 03, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very attractive, varied trail, the passage between Les Commères is one of the highlights of this hike.
A great way to explore the region.

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Tirry
Tirry
• Edited:

Overall rating : 4 / 5

Date of your route : Mar 06, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

Hike done on a cold day, with sunshine.
Very pleasant route from 1 to 9. Encounter with a chamois at Château Villain. From 9 to 14, a little monotonous.
We had a picnic near the little chapel.
Pleasant overall.

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Renard 39
Renard 39

Overall rating : 5 / 5

Date of your route : Dec 21, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very pleasant hike. No one else on the trail (it's December). Perfect description. The sign for "Rocher des Commères" is still missing, but with the map, it's easy to find. The cables on the Escalier des Coucous are very helpful when the trail is muddy.

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Rabatteur27
Rabatteur27

Overall rating : 4 / 5

Date of your route : Jul 13, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

Very beautiful hike, fairly well shaded during heatwaves
I got lost twice... the markings are sometimes missing, leaving room for doubt...
Shorter version by taking the GR at point 10
Also very nice
Saw several chamois

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DROUILLOT
DROUILLOT

Overall rating : 4.7 / 5

Date of your route : Jul 10, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Thank you very much for this beautiful hike. We just found the long, monotonous stretches at (9) and (14) on less pleasant paths with limited scenery. But everything else is superb and a big advantage: there is always water at the Ain sinkholes, even during droughts. There are more people around the Ain sinkholes, but not excessively so.
Suggested picnic spots: bench at the castle chapel (7) and table with benches at Syam (13).

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richardd
richardd

Overall rating : 4.3 / 5

Date of your route : Jun 12, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very interesting hike with several beautiful views of the Ain Valley and the surrounding villages. Les Perte de l'Ain is a magnificent place. Most of the hike takes place in the forest, which is very pleasant in hot weather. A must-do.

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