The ridges of Innimont

A beautiful, long climb on a good path to the Col du Grand Pertuis, followed by the superb ridge trail. Then a challenging downhill section to Innimont and a gentler one back down to Appregnin.

Details

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  • Mountain biking
    Activity: Mountain biking
  • ↔
    Distance: 21.49 km
  • ◔
    Duration according to the author: 3 hrs 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 783 m
  • ↘
    Descent: - 776 m

  • ▲
    Highest point: 1,157 m
  • ▼
    Lowest point: 393 m
  • ⚐ Country: France
  • ⚐
  • ⚐ District: Saint-Germain-les-Paroisses (01300)
  • ⚑
    Start/End: N 45.765536° / E 5.609856°
  • ❏
    IGN map(s): Ref. 3231OT, 3232ET

  • ◶
    Type of surface:
  •  
     
     
     33% Road  34% Byway  33% Path
  • ⇧
    Bike carrying: Not specified
  • ▲
    Difficulty: Not specified
  • Hour-by-hour weather

Description of the route

The start is in the hamlet of Appregnin, in the commune of Saint-Germain-des-Paroisses, near Belley. Shaded car park in the centre.

(S/E) From the car park, turn right towards Saint-Germain-les-Paroisses.

(1) After 250m, take the path branching off to the left. After 500m, continue left onto the correct path.
After 200 m, the path continues with a sharp right-hand bend and, from there, there is no doubt about the route for the next 5.5 km. You finally reach a very short downhill section.

(2) At this point, a path that is quite muddy in wet weather climbs north-westwards; a fairly steep section means you have to push your bike. The path levels out and reaches a fork.

(3) Take the path on the far left for 200m to reach a much better track.

(4) Follow it to the right until you reach theGR®59signpost.

(5) At 1500 m (altitude 1090 m), turn left; the Col du Grand Pertuis is 300 m away.

(6) At the pass, head due south along the path which climbs steeply towards the ridges. Push your mountain bike for 100 m before reaching a beautiful, well-maintained path that runs along the ridges, sometimes through woods, sometimes across meadows, on theGR®59.

(7) The path descends to the Col du Petit Pertuis via a very “stony” track. Take care, therefore, and watch out for the many hikers in this area. Along the way, an orientation table helps you take in the exceptional views in fine weather.

Cross the car park and continue due south. Pass the hang-gliding launch site. The path climbs to the right then to the left and runs along the cliff, protected by a barrier. It arrives at the Croix de la Roche.

(8) Leave theGR®59, which descends below the cross and has become dangerous; instead, take the path that heads due north from the cross and runs alongside the fitness trail.
After 200m, you will find a good path leading down to the left.

(9) Follow this path down until you rejoin theGR®59, then follow theGR® to the right as far as Innimont. Continue along theGR® and, at La Chèvrerie, leave theGR® and follow the road to a fork.
Turn left onto the path leading to the sewage treatment plant.

Continue along this well-marked path, signposted “Tour du Plateau”, for 1.3 km. A signpost indicates a path on the left.

(10) Take this path and begin the long descent through the forest back to Appregnin at the starting point (S/E).

Waypoints

  1. S/E : km 0 - alt. 398 m - Car park in the hamlet of Appregnin
  2. 1 : km 0.32 - alt. 393 m - The path starts on the left
  3. 2 : km 6.8 - alt. 925 m - End of the track
  4. 3 : km 7.41 - alt. 993 m - Turn left at the fork
  5. 4 : km 7.61 - alt. 1,022 m - Turn right at the fork
  6. 5 : km 9.09 - alt. 1,083 m - Junction with the GR59
  7. 6 : km 9.42 - alt. 1,097 m - Col du Grand Pertuis
  8. 7 : km 12.02 - alt. 1,043 m - Col du Petit Pertuis
  9. 8 : km 12.63 - alt. 1,008 m - Croix de la Roche
  10. 9 : km 12.85 - alt. 998 m - Downhill path
  11. 10 : km 16.64 - alt. 866 m - Signpost towards Appregnin
  12. S/E : km 21.49 - alt. 399 m - Car park in the hamlet of Appregnin

Notes

Water point at the start in the car park.

Worth a visit

Panoramic views of northern Isère, Mont Blanc and the Grand Colombier.
In summer, the extraordinary flora: martagon lilies, orchids and carnations.
Innimont: the wash houses, the bread oven and the church, but you have to climb up to them.

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

4.7 / 5
Based on 5 reviews

Reliability of the description
4.8 / 5
Ease of following the route
4.4 / 5
Route interest
4.8 / 5
User 4323515

Overall rating : 5 / 5

Date of your route : Apr 06, 2026
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

I didn't use the guidebook, just the map, and it was perfect

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licence54
licence54

Overall rating : 5 / 5

Date of your route : Apr 03, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Good evening

We did the route in reverse and I find it easier to start with the ‘steep’ climb and finish with the track and the road.
Otherwise, there are some stunning 360° views and an easy-to-follow path.

Best regards

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clemberny
clemberny

Overall rating : 4 / 5

Date of your route : Sep 04, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk, though the climb is a bit monotonous as it follows a forest track with little to see; but as soon as the path narrows out before the summit, you start to discover a magnificent landscape, and then, when you reach the ridges, it’s simply sublime – you can see for miles and miles, with mountains on one side and the AIN plain on the other. The descent is really enjoyable along a narrow single track. Perfect weather.

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geronimo38
geronimo38

Thank you for your feedback; at the moment, many paths have been damaged by the heavy rain over the last few days.

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Paul Prozeller
Paul Prozeller

Overall rating : 4.3 / 5

Date of your route : Jun 18, 2018
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good

The route description is well written. The maintenance of the route from point 9 (Croix de la Roche) onwards is rather poor. We had to backtrack several times to find the right path. The final descent (around point 11) is quite dangerous and also poorly maintained.

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geronimo38
geronimo38

OK, you’re right, there might be some doubt, but looking at the map, it’s clearly a dead end.

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dede2610
dede2610

We are using the map and the route description...
The place where you need to turn right is at checkpoint number 3 at kilometre 6.8 and an altitude of 934 metres.

Kind regards

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geronimo38
geronimo38

Good evening, yes, it’s physically demanding, but so beautiful

It would be useful to clarify exactly where the path becomes confusing

Thank you

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bibi
bibi ★

Thank you for your feedback. When mountain biking, do you use the description and the map? Or just one of the two? Or perhaps the mobile app?
Kind regards

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dede2610
dede2610

Overall rating : 5 / 5

Date of your route : Jun 10, 2017
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

Hello, just a quick note... After the very short downhill section, the path continues straight ahead or to the right. You need to turn right (the path that goes straight ahead ends in a dead end after about 15 minutes).
Otherwise, it’s a great mountain bike ride, quite a workout – make sure you bring water as there are no springs along the route!

Best regards!

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