Montagne d’Izieu and Grand Thur from Murs

The Montagne d’Izieu and the Grand Thur are accessible all year round via numerous paths criss-crossing the area. The circular route described here takes you along these paths from the Route de Fay via pleasant wooded trails.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 5.89 mi
  • ◔
    Average duration: 4h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,821 ft
  • ↘
    Descent: - 1,798 ft

  • ▲
    Highest point: 2,477 ft
  • ▼
    Lowest point: 945 ft

Photos

Description of the walk

Murs-et-Gélignieux can be reached from Belley via Peyrieu or from Saint-Genix via Brégnier-Cordon. In the hamlet of Gélignieux, take the Chemin de Fontanette towards Fay. Just before the entrance to a quarry, park near a water reservoir on the left-hand side of the road.

(S/E) From the reservoir, walk back down about twenty metres and turn right onto the path known as the Sentier de la Pierre, which climbs steadily northwards in a series of wide hairpin bends. The gradient then steepens as you enter the forest, climbing north-westwards up the slope and skirting a rocky outcrop before emerging into the meadows of Rongère.

Climb up through a first meadow, then, after a few trees, a second one.

(1) At the top, avoid turning right onto the service track which leads directly back to the Route de la Grande Montagne (and forces you to follow the tarmac), but take the earthen embankment which slopes down onto a small meadow sloping northwards, at the foot of which a path begins. This path descends steeply, then veers to the right to wind down a series of terraces at the foot of a scree slope before joining the Route de la Grande Montagne at the level of its hairpin bend.

(2) Climb a few metres and immediately turn left onto the Sentier du Grand Thur, which starts at the same level. It crosses a few paths leading down to the left. Make sure to stay on the path, which climbs gently as it crosses the western face of the Montagne d’Izieu.

Below the Grand Thur, the slope becomes steeper; then, after a right-hand bend and a short descent, the path climbs sharply to the left up a steep slope through a gully between two rocky peaks, emerging at a major junction on the wooded plateau of the Grand Thur.

(3) The forest limits the views: first, take a round trip north-west to the geographical summit of the Grand Thur, marked by a triangulation point, then head north along a good path to a viewpoint overlooking the Gland valley.

(4) Return via the same route or by turning right twice along a narrow path on a small ridge. Follow the main access track southwards for a few dozen metres (the standard access route from the Route de la Grande Montagne).

(5) At the foot of the first descent, turn left onto the north-easterly forest track. It follows the wooded ridge for a while, then turns right and descends to join another forest track coming from the right. Take this track to the left to climb back up and cross a threshold.

(6) Just past this ledge, leave this well-marked path, which descends to the right, and take a less defined, straight and level path heading north. It comes to a gully: continue straight on to descend via a track through this gully and veer left to climb back up along the bottom of the thalweg to the ridge.

There, two parallel paths lead off to the north-east: one along the north-western flank of the ridge through the forest, the other (GPS track) along the south-eastern flank, which is grassier but more overgrown. The two paths join to form a proper path leading down into the forest.

(7) At one point, an open, rocky section of the ridge is visible on the left; climb up there via a short, return path for a final viewpoint overlooking the Bugey. 100 m further on, before the 705-point mark, the path turns right to descend and join a wider forest track coming from the right. Follow it to the left and continue descending straight ahead, ignoring the paths branching off to the left, then crossing the gravelled section of the Route de la Grande Montagne. Follow theGR® 59 markings for a while. Ignore several more junctions until you reach the one where the marked path veers off to the left.

(8) Take the path on the right, which climbs slightly and, at a cairn, turns downhill towards Fay. This path, known as the R8 (due to a wreck located along its route), winds its way down through Les Carteries and then Côte la Clef before heading more directly down the slope, passing the R8 and joining the correct stony path coming from La Pierre du Regardeur. Take this path on the right, which leads to the hamlet of Fay on the road known as the Chemin de Veyle.

(9) Turn right to descend along the south-western slope. The road becomes a country lane that is increasingly hard to follow towards Bionnaz and ends in a meadow where the path climbs up to the right. Leave the main path to take a track at the foot of this meadow which crosses a copse to reach more grassy areas, allowing you to descend gradually towards the Route de Fay. Just before the road, head up to the right to visit the statue of the Virgin Mary and rejoin the road at the Source Merveille.

(10) Return to the starting point either via the road or along the left bank across grassy ground, following the route of the buried gas pipeline, until you reach the entrance to the quarry (S/E).

Waypoints

  1. S/E : mi 0 - alt. 948 ft - Route de Fay – water reservoir
  2. 1 : mi 0.83 - alt. 1,716 ft - Rongère – top of the meadows
  3. 2 : mi 1.07 - alt. 1,519 ft - Route du Grand Thur/Route de la Grande Montagne – hairpin bend
  4. 3 : mi 2.18 - alt. 2,467 ft - Grand Thur – summit plateau
  5. 4 : mi 2.32 - alt. 2,464 ft - Belvédère du Grand Thur
  6. 5 : mi 2.46 - alt. 2,438 ft - Junction: Main path / Path to the ridge
  7. 6 : mi 2.86 - alt. 2,346 ft - Junction with the track continuing along the ridge
  8. 7 : mi 3.24 - alt. 2,329 ft - Viewpoint on a rock on the ridge
  9. 8 : mi 3.66 - alt. 1,972 ft - Junction with the R8 path
  10. 9 : mi 4.8 - alt. 1,181 ft - Fay – Chemin de la Veyle
  11. 10 : mi 5.43 - alt. 994 ft - Statue of the Virgin Mary
  12. S/E : mi 5.89 - alt. 948 ft - Route de Fay – water reservoir

Notes

There are no water sources in this type of terrain.

The number of tracks and forest paths, some of which are overgrown (brambles), makes it difficult to find your way around the Montagne d’Izieu. A map and GPS are strongly recommended.

An alternative route, which avoids having to descend during the ascent and shortens the walk, is possible by taking the path on the right at the top of the Rongère meadows, joining the Route de la Grande Montagne, following it up to En Bochet and then taking the forest track leading directly to the Grand Thur.

This circular walk was directly inspired by the posts on this area on the Sentier-Nature website.

Worth a visit

As the route is mainly through woodland, views are few and far between: a few glimpses towards the Rhône Valley and the Chartreuse as you climb to the Grand Thur; viewpoints on the Gland Valley side (towards Prémeyzel, the Grand Colombier, the Montagne de Tentanet and the Mollard de Don); and a few glimpses from the ridge towards the Dent du Chat and the Tournette, then as you descend towards Fay.

Always be cautious and plan ahead when you're outdoors. Visorando and the author of this route cannot be held responsible for any accidents occurring on this route.

The GR® and PR® markings are the intellectual property of the Fédération Française de Randonnée Pédestre.

Reviews and comments

3.6 / 5
Based on 6 reviews

Reliability of the description
4 / 5
Ease of following the route
3.2 / 5
Route interest
3.7 / 5
missgrazou
missgrazou

Overall rating : 2.3 / 5

Date of your route : Sep 21, 2025
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★☆☆☆ Disappointing
Very busy route : No

I confirm that this route is not very well signposted, if at all. Fortunately, we are using GPS tracking, as we had to turn back several times.
And indeed, the views are no longer clear due to the vegetation in the woods. The slopes are quite steep!
On the other hand, for those who appreciate it, you find yourself in some very beautiful woodland.
We experienced this hike more as a day of exercise

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GABY et OLIVIER
GABY et OLIVIER

Overall rating : 3 / 5

Date of your route : Sep 02, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★☆☆ Average
Very busy route : No

Without the app or a map, it's complicated.
In some places, the trail disappears into the vegetation.
The views are not very clear.
Nevertheless, there are some beautiful stretches through the forest.

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Héritier
Héritier

Overall rating : 4.3 / 5

Date of your route : Feb 21, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A very lovely but challenging route – the climb is quite steep on the first part of the route up to the Grand Thur – you absolutely must take a GPS and a map as there’s a high risk of getting lost – the paths sometimes disappear or have even vanished altogether, and are littered with fallen trees and broken branches. Best avoided in strong winds to prevent branches falling on your head – that said, this does lend the walk a wild character, which makes it interesting

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traminées
traminées

Overall rating : 4 / 5

Date of your route : Oct 24, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Hello

A walk enjoyed in fine weather.
Despite the instructions making it a bit tricky to find the right starting point – with no marked route or signposts
for practically the whole walk. Without a GPS, it was tricky.
In places, the countryside quickly takes over and it’s not easy to stay on the path.
A lovely walk worth doing again, whilst trying to find the right path and hoping for a bit more signposting...

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Rascasse7
Rascasse7

Overall rating : 4.7 / 5

Date of your route : Aug 20, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

I completed this route in fine weather; despite the detailed description, the path is difficult to find between points 6 and 7, as the vegetation is dense along this rarely used stretch. As this section offers no particular ‘tourist’ attraction (other than the chance to play at being Indiana Jones ), I think it’s best to continue down the track after point 6, take the path a little further down on the left, and then head back up towards point 7. This only adds about 150 metres to the distance and a few metres of elevation gain, but makes the walk much easier.
Another quick note: for parking, I think it’s best to carry on along the road towards Fay – there’s a small car park near the statue of the Madonna that can accommodate several cars and has the advantage, when starting the walk, of allowing you to warm up on flat ground as you make your way to the starting point of the GPS track.
A very lovely walk that I’d happily do again in the autumn, perhaps with a few variations.

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Visophi
Visophi

Overall rating : 3.3 / 5

Date of your route : May 19, 2021
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★☆☆ Average
Very busy route : No

Hello,
Hike completed on 19 May 2021. It had rained in the days leading up to the hike and we had a few showers during the walk. This made the climbs quite challenging at times on very slippery ground.
The description alone isn’t enough to complete this route. A GPS and the track are essential. I admit that describing this route is difficult. Landmarks are few and far between, and when there are orange markers or cairns, they aren’t much help.
I’d like to make the following comments:

  • Shortly after setting off, the path splits into two. Take the one blocked by a large boulder.
  • After point 6, the path is described as ‘obstructed’. It is even blocked by hazel bushes in some places, so you need to pass between the rock and the left-hand side of the hazel bushes, without leaving the ‘path’.
  • Unless you know the route well, I think you should allow at least 5 hours the first time
  • Finally, the route crosses meadows. If we follow the track, we’ll be walking right through the middle and trampling the grass. I’m not sure the farmers would appreciate that. You should walk along the edge of the fields.

Kind regards

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