The Val d'Ainan and the Clermont Tonnerre tower

This walk is not difficult, except for the distance. In the first part, you walk along the Val d'Ainan Nature Reserve, then you follow a pleasant, soft path through the woods. After a detour to the Clermont Tonnerre tower, you return to Chirens via paths or small, quiet roads.
In the second part of the route, if the weather is clear, you will have beautiful views of the Chartreuse Mountains.

Details

2649059
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  • Walking
    Activity: Walking
  • ↔
    Distance: 11.03 km
  • ◔
    Average duration: 3h 45 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 200 m
  • ↘
    Descent: - 192 m

  • ▲
    Highest point: 637 m
  • ▼
    Lowest point: 457 m

Photos

Description of the walk

Park in one of the car parks near Chirens Church.

(S/E) You will be in front of the façade of Chirens Church with the church behind you and a large iron cross in front of you. Set off to the left along the departmental road. Walk past the village hall. Very soon, you will see a narrow lane on your left (Chemin de Beaudiné). Take this lane and follow it to the end of the Val d'Ainan.

(1) Halfway down the valley, on your left, you will see a platform with educational panels explaining the glacial origins of the valley. Continue on your way.
At the end of the path, you will find a T-junction. There is also a sign: L'Anvers alt. 451m.

(2) Turn left towards the Arsenal and Clermont. You will soon come to another signpost (L'Arsenal), which you ignore by continuing straight ahead. You will come out onto the D82, which you take on the left.
Be careful here. Stay on the left side of this road as there is no hard shoulder on the opposite side.
You will come to a stop sign on the D1075.

(3) Be very careful here: cross with great caution as this road is very busy.
Opposite, take a small road that climbs steeply. This is Chemin du Mollard, which is a one-way street (except for public services). Follow this road. It winds its way uphill. When you reach a platform with a car park on the left (at No. 408), continue on the right. Almost immediately, take a grassy path on the left. This leads to a small road, which you take on the right.
Very quickly, you will see a sign for La Reviriaz - altitude 541 m, at the edge of a path on the left.

(4) Take this path, which is particularly pleasant as it runs through the woods. Follow it for a while until you come out of the woods. Walk alongside a small pond. You will come to a small road, which you should take on the left. This will take you to the village of Clermont. At the stop sign, turn left.
You will see a sign for Clermont - altitude 571 m.

(5) Turn right towards the tower, taking the Chemin de la Tour. The tarmac gives way to a wide stony path that climbs up to a meadow. Continue climbing up the meadow, keeping to the right, on the edge of the woods. When you arrive directly below the tower, you will see a path leading into the forest on the left. Take this path.
You will soon arrive at an esplanade in front of the tower. Enjoy the view of the Chirens valley and, in the background, the Chartreuse mountains.

(6) Turn back and follow the same route as on the way up (when you leave the esplanade, there is a fork in the path. Take the path on the left). You will return to the meadow and descend towards Clermont.

(5) Back in the village centre, at the sign for Clermont - Alt. 571m, take the street on the right towards Chirens (there is no pavement). You will come to a fork near a transformer. Go down the dead-end street opposite on the left (this is Impasse de la Courriaz).

(7) Your cul-de-sac turns to the right, and you will see the sign for La Courriaz - alt. 534 m. Continue to the right towards La Garangère. Your road turns into a beautiful grassy path. You will come to a road; make a zigzag right/left turn to continue in the same direction. Your road is closed to vehicles over 2.30 m wide and over 19 tonnes.
You will arrive at the sign for La Garangère - altitude 527 m.

(8) Turn left and then immediately right (double sign for Charpènes/Garangère). When you reach a farm, take the path down to the left.
You will come to a T-junction. You will see the sign for Le Ruibet - altitude 482 m.

(9) Turn left. You will soon come to a fork and a sign for Les Brosses - altitude 482 m. Take the gravel path on the right towards Chirens (ignore the grassy path).
At the entrance to Chirens, you will see a sign for Les Jolis - altitude 465 m.

(10) Continue straight ahead (not marked in yellow). You will come to a stop sign. Continue straight ahead (pedestrian and cycle zone). Your lane turns right to return to the church and your starting point (S/E).

Waypoints

  1. S/E : km 0 - alt. 464 m - Chirens Church
  2. 1 : km 1.62 - alt. 460 m - Educational platform
  3. 2 : km 2.26 - alt. 460 m - Signpost L'Anvers altitude 451m
  4. 3 : km 2.99 - alt. 461 m - D1075 (Voiron/La Tour du Pin)
  5. 4 : km 3.65 - alt. 545 m - Sign La Reviriaz altitude 541 m
  6. 5 : km 5.68 - alt. 573 m - Sign Clermont alt. 571 m
  7. 6 : km 6.61 - alt. 637 m - Tour of Clermont Tonnerre
  8. 7 : km 7.97 - alt. 544 m - Sign La Courriaz altitude 534 m
  9. 8 : km 8.55 - alt. 529 m - Signpost La Garangère altitude 527 m
  10. 9 : km 9.56 - alt. 483 m - Sign Le Ruibet altitude 482 m
  11. 10 : km 10.34 - alt. 469 m - Sign Les Jolis altitude 465m
  12. S/E : km 11.03 - alt. 464 m - Chirens Church

Notes

The walk starts in Chirens, a small village in the Isère department north-east of Voiron. There are three small car parks near the church.

Almost the entire walk is marked in yellow. These markings are sometimes very faded.

There is a rather unpleasant 500-metre stretch before you reach marker No. 3, where you walk along a fairly busy road (D82). It is advisable to stay on the left-hand side of the road as there is no hard shoulder on the right. Otherwise, the walk is fairly sheltered from traffic.

Worth a visit

The Val d'Ainan nature reserve is a pretty little valley. In the middle of the valley, an educational platform provides information about the glacial origins of the area.
The Tower of Clermont Tonnerre, the remains of an ancient feudal castle, is one of the highlights of the route.
The Priory of Chirens is renowned, particularly for the concerts held there.

Reviews and comments

4.6 / 5
Based on 12 reviews

Reliability of the description
4.8 / 5
Ease of following the route
4.8 / 5
Route interest
4.3 / 5
Phil38
Phil38

Overall rating : 4.7 / 5

Date of your route : Nov 24, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hiking, really nice, not difficult, very pleasant, few roads and lots of paths.
Thank you for this route.
Philippe

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Deborando
Deborando

Overall rating : 4.7 / 5

Date of your route : Aug 17, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

The weather had cooled down a bit, which was perfect for a morning hike. The terrain varied between tarmac roads and grassy or stony forest paths. For me, the detour to the tower wasn't really worth it, except for the view.

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Gabrielle Duclos
Gabrielle Duclos

Overall rating : 5 / 5

Date of your route : Jun 11, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A short walk near my home

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AurelMiller
AurelMiller

Overall rating : 4.7 / 5

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

A lovely walk, easy to do, with little elevation gain. Beautiful views on the way up to the Chirens tower. The total time may be overestimated; it took me an hour less.

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Emesse
Emesse
• Edited:

Overall rating : 5 / 5

Date of your route : Nov 11, 2022
Reliability of the description : Not used / Not applicable
Ease of following the route : Not used / Not applicable
Route interest : ★★★★★ Very good
Very busy route : No

Hike tracked by GPS. Easy walk with no particular difficulties. Walking on tarmac paths is no problem as there is no traffic on these roads.
Beautiful views under a blue sky and soft green meadows!
Conclusion: a wonderful day out... Thank you for this lovely route.

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Luhu
Luhu

Overall rating : 4.3 / 5

Date of your route : Jun 14, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful, varied walk without any difficulty. Parking spaces near the church are free, but the maximum parking time is only two hours. You can park on Rue du Moulin Defilion or in the spacious car park on Route de la Cascade/Rue des Rampeaux. (This is also the end of the walk.)

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pierre bonnardon
pierre bonnardon

Overall rating : 4.3 / 5

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

A beautiful walk alternating between the Chirens ENS marshes and the foothills of Clermont hill, ending in a rural area between Bonpertuis and the village of Chirens. Note that it is
slight difficulty in finding the grassy path above number 408...

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vuagnoux
vuagnoux

Overall rating : 4.7 / 5

Date of your route : Feb 05, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Easy tour, beautiful view at the Clermont tower; lovely passages between 1 and 2, 4 and 6, 8 and 10.

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Eric5
Eric5

Overall rating : 4.7 / 5

Date of your route : Dec 10, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A pleasant country walk, fairly easy to follow thanks to the yellow markings.

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Chaelemagne
Chaelemagne

Overall rating : 5 / 5

Date of your route : Jul 09, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very good description of the route.
A very pleasant hike in hot weather as there are many shaded sections.
As noted in the description, the yellow markings are quite 'worn'.

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Dominol
Dominol

Overall rating : 4 / 5

Date of your route : Jun 12, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

A very pleasant walk in the Ainan Valley from the start to marker 2, as you walk between a sensitive natural area on the left and a hunting reserve on the right.
Parts 4 to 6 are also very pleasant.
The negative points are the section along the D82, as highlighted in the description, and the fact that the D1075 is very busy and the noise from traffic disturbs the peace and quiet of the area on the first part of the route.

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Bruno C.
Bruno C.

Overall rating : 4.7 / 5

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

Hello, nice walk! Just a note in the route description: "When you reach a platform, car park on the left (at No. 408), continue on the right. Almost immediately, take a grassy path on the left." -> We would say instead to take the grassy path above the car park located to the left of the entrances to houses No. 408.
This is because the start of the path is not very visible.
Thank you for this route.
Kind regards

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