Lac de Vert, tunnels and viaduct from Talencieux

Starting from Talencieux, the route passes by Lac de Vert, then the Midon tunnel and a short detour through the countryside before returning to the old railway line to cross the Thorrenc Viaduct, the Thorrenc Tunnel and the Thorrenson Viaduct. Don't forget a headlamp or other light for crossing the two tunnels.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 15.42 km
  • ◔
    Average duration: 5h 25 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 353 m
  • ↘
    Descent: - 349 m

  • ▲
    Highest point: 401 m
  • ▼
    Lowest point: 275 m

Photos

Description of the walk

Park on the square on the right after the roundabout, right next to the cemetery.

(S/E) Head south-west on the pavement, cross the D 370 at the pedestrian crossing, then cross the small park and take the small street heading south. At each junction, keep right to stay on the GRP Tour du Bassin d'Annonay trail, marked in red and yellow. You will reach a four-way junction on the edge of a vineyard.

(1) Keep to the right-hand path towards the hamlet of Balais. Cross the hamlet and continue to follow the GRP°°® signs to Lac de Vert.

(2) Leave theGRP® here and take the wide path on the right heading north-west. Follow the lake for a short while, then leave it and climb up through an oak forest to reach a small bridge over the railway line.

(3) Do not cross the bridge, but take the small path on the left that joins the railway line. Turn right towards the Midon tunnel. Switch on your lights to cross this 782 m long tunnel. At the tunnel exit, continue for about 300 m along the track and pass under a bridge.

(4) Take the small path on the right to cross this bridge. Continue on the path opposite towards the hamlet of Revèlardon, cross the hamlet and take the small tarmac road towards L'Eterpas until you reach a hiking signpost.

(5) Turn right onto the path, descend to a small stream, then climb back up a small road. Follow it to the left, between the old houses of the hamlet, then turn right onto Rue du Tilleul until you reach a small paved road, Rue de L'Aubépine.

(6) Turn right onto this road. It quickly becomes a path at the first crossroads. Continue right towards an oak forest, staying on the main path. Be careful here: many crossroads have been created by mountain bikers. Join the small Ruisseau des Aygas stream.

(7) Cross it and then head back up towards Pied Lecte. Continue straight ahead on a small paved road and follow it to the crossroads at the entrance to the hamlet of Solore.

(8) Turn right onto the path and descend quickly southwards to a small road. Cross it once, then rejoin it very quickly.

(9) Go up it for about ten metres, do not take the road opposite towards the small bridge, but take the path downhill on the left. Pass some boulders and a barrier to rejoin the old railway line. Follow it, passing the 110-metre-long Thorrenc Viaduct, then the 262-metre-long Thorrenc Tunnel and finally the Torrenson Viaduct. Continue along the old track to reach the crossroads at the bridge at the exit of the Midon Tunnel passed on the way out.

(4) Reach the bridge, but do not cross it. Instead, head south on the path. Climb up into a pine forest. At the next crossroads under the high-voltage line, turn left, cross the Fromentoux stream and join the road leading to the hamlet of Ozas.

(10) Turn left towards the east, into the hamlet, and pass a small square. At the next crossroads, turn left and then right twice until you reach the hamlet of Ozas. Here you will rejoin theGRP® Tour du Bassin d'Annonay.

(11) Turn right and continue until you reach this hamlet and a crossroads with five paths.

(12) Take the right-hand road heading south, which will take you back to the village of Talencieux. Turn into the street leading to the cemetery to find the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 373 m - Parking near the Talencieux cemetery
  2. 1 : km 0.85 - alt. 349 m - Crossroads towards Balais
  3. 2 : km 3.29 - alt. 342 m - Lac de Vert
  4. 3 : km 4.17 - alt. 344 m - Railway bridge
  5. 4 : km 5.37 - alt. 328 m - Crossroads of the loop
  6. 5 : km 6.33 - alt. 367 m - Hiking signpost
  7. 6 : km 6.79 - alt. 377 m - L'Eterpas
  8. 7 : km 8.37 - alt. 322 m - Aygas stream
  9. 8 : km 9.27 - alt. 366 m - Solore
  10. 9 : km 9.71 - alt. 305 m - Route - Château de Thorrenc
  11. 10 : km 12.61 - alt. 371 m - Crossroads towards Ozas
  12. 11 : km 13.31 - alt. 376 m - Ozas
  13. 12 : km 14.4 - alt. 400 m - Chardenaud
  14. S/E : km 15.42 - alt. 373 m - Parking near the Talencieux cemetery

Notes

Circuit, two small sections of which are shared with hikes in Thorrenc and Talencieux, suggested by Filou and Charlie07 Visorandonneur.
Don't forget a torch as the tunnels are very dark. Not suitable for claustrophobics.
The section of track between Saint-Rambert-d'Albon and Annonay was opened in October 1869. Saint Rambert Firminy line.

Worth a visit

Several viewpoints along the route.
From the Thorrenc Viaduct, there is an excellent view of the village with the old castle and church.
Thorrenc Viaduct, 110 m long and composed of nine 10-metre-high arches.
Torrenson Viaduct, with a single arch 20 m high.
Thorrenc Castle

Reviews and comments

4.8 / 5
Based on 23 reviews

Reliability of the description
4.9 / 5
Ease of following the route
4.6 / 5
Route interest
4.9 / 5
Vonvon
Vonvon
• Edited:

Overall rating : 5 / 5

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

An interesting hike with varied landscapes. I enjoyed going through the tunnels. Make sure you wear waterproof footwear as there is a section of the route where water runs down, but it's fine with walking sticks. Thank you to the author.

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Fck07
Fck07
• Edited:

Overall rating : 4.3 / 5

Date of your route : Mar 11, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful hike that I had already had the opportunity to do a few years ago. The Midon tunnel is always impressive and the view of Thorrenc from the viaduct makes for some great photos. There are a few missing markings, but with a map or GPS, it's no big deal. Good shoes are recommended, as walking on the ballast from the old railway track is not very pleasant. The mileage on the map is accurate, just a difference in elevation between what is stated and my Garmin 426 (+417). As for the estimated time of over 5 hours, that's a bit pessimistic. I did it in 3 hours and 20 minutes with two photo stops and two refreshment stops. Don't forget your torch!

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CaroDuetti
CaroDuetti

Overall rating : 5 / 5

Date of your route : Sep 22, 2024
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A small detail that I appreciate seeing in reviews when I start a hike late in the day: I completed this hike in 3 hours and 45 minutes, taking time to stop and admire the castle.

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CaroDuetti
CaroDuetti

Overall rating : 5 / 5

Date of your route : Sep 22, 2024
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Hike completed on a Sunday after light rain the day before. The weather was overcast, but this allowed us to enjoy the views and the variety of places along the hike, which is what makes it so interesting: walking along the lake, going through tunnels (be careful, this can be a bit scary), seeing a beautiful castle, crossing an old railway line high above the ground, and walking through vineyards. Be sure to bring good shoes and a torch. Note regarding other comments: the path after the first tunnel has been cleared and trees are blocking the way, but it is still possible to get around them (previous travellers have done so), and make sure you climb up above the bridge when you pass underneath it (I continued without paying attention, even with GPS) because it is difficult to see if you're not looking carefully. A very steep and muddy little path!

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Jean-Paul KERENFORT
Jean-Paul KERENFORT

Overall rating : 4.7 / 5

Date of your route : Apr 20, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Beautiful hike, bring waterproof shoes and torches, follow the signs carefully.
We missed the trail on the right at point 5 (hiking signpost); the trail is closed by two barriers, but we turned around and took the trail anyway.
Be careful at point 9, Château de Thorrenc road, where you need to take the road on the right for a few metres.
Part of the path runs through a stream that was intermittent and had water in it on that day.
A varied and very uninteresting hike, thank you to the author.

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Jean-Paul KERENFORT
Jean-Paul KERENFORT

Overall rating : 4.7 / 5

Date of your route : Apr 20, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Beautiful hike, bring waterproof shoes and torches, follow the signs carefully.
We missed the trail on the right at point 5 (hiking signpost); the trail is closed by two barriers, but we turned around and took the trail anyway.
Be careful at point 9, Château de Thorrenc road, where you need to take the road on the right for a few metres.
The path crosses an intermittent stream, which was full of water on the day we were there.
A varied and very uninteresting hike, thanks to the author.

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fr.simon
fr.simon

Overall rating : 5 / 5

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

a beautiful hike. Bring powerful torches for the tunnels and waterproof shoes.

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Joelle Grandhomme
Joelle Grandhomme

Overall rating : 4.7 / 5

Date of your route : May 03, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

Very pleasant hike. Planning to tell my friends about it.

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fmaddajae
fmaddajae

Overall rating : 5 / 5

Date of your route : Apr 15, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

An unusual and very pleasant hike.
This route, which follows abandoned and private railway tracks according to the signs, would benefit from further development and safety improvements. Let's hope that the local authorities will one day realise and exploit the potential of this route.
A very beautiful hike.
As mentioned above, at point 5, there are two barriers.
A powerful torch is also recommended for crossing the tunnels
Thank you to the author for allowing us to discover this very pretty route

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Fandol
Fandol
• Edited:

Overall rating : 5 / 5

Date of your route : Mar 26, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

To think it took me so long to finally discover such a magnificent hike so close to home!
Honestly, this old railway line, built at great expense at the end of the 19th century, really deserves to be restored. What is our Ardèche department doing about it? It wouldn't hurt the Haut-Vivarais region, which isn't as well known as the south but is definitely worth a visit. We've created the Via Rhôna and the Via Fluvia, and we've invested in them, which is all well and good, but with this railway line abandoned in favour of road transport, we have a treasure that this hike, like the one that goes north from Champagne to Saint-Désirat, really showcases.
If we hesitated a few times, it wasn't because the description was inadequate, but rather because a lot of new houses are being built in the hamlets we passed through, which has changed the appearance of the paths a little.
The Midon and Thorrenc tunnels: the first one, which is the longest, is a bit stressful to go through, but it's worth it for the highlight of the hike, the Thorrenc viaduct and the extraordinary view of the village and its castle.
We also loved the long stretch through the forest with the Aygas stream, the aygue, meaning 'water' in Occitan.
Otherwise, we came across some walkers but also three quads and three motorbikes, which were noisy, whereas the horses (four of them), although they take up space, are rather relaxing...

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Bigdam
Bigdam

Overall rating : 5 / 5

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

Walking in December means you're sure to have peace and quiet along the way: with GPS, it's hard to get lost, the route is varied and there are few hills. Only the path along the railway line was relatively flooded by the rain of the previous days and the small stream, but the route is perfect and enjoyable in terms of historical discoveries: tunnels, a viaduct and even a magnificent little castle.

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The user account associated with this content has been deleted.

Jean m 26
Jean m 26

Overall rating : 5 / 5

Date of your route : Sep 29, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

hello everyone, and thank you very much for this hike, which was very interesting from a historical, railway and nature perspective.
For those who don't want to take the 700-metre-long tunnel at number 3, continue along the bridge and the dirt track until you reach the D370 road, then cross over and the path will take you to number 4.
the village of Thorrenc is truly beautiful in the valley below.

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alnobal07
alnobal07

Thank you very much, I'm very happy to share the hike.

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denis.baborier
denis.baborier

Overall rating : 5 / 5

Date of your route : Aug 08, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Hello,
thank you for the detailed description of this magnificent hike: we had a wonderful time in a superb landscape: walking among vineyards, a small lake, a tunnel, an oak forest: hiking in a very varied landscape. The route was easy to find thanks to your excellent guidebook.
Best regards

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