Plateau des Charmilles, Grotte de la Jaquette

A beautiful hike, fairly well marked in blue with directional signs (sometimes a little faded), between 630 and 900 metres above sea level, easy, mostly on good, well-shaded paths. On very clear days, there are views of the snow-capped Alps and the villages of Marchand and Cerin. For flower lovers, between May and July, there are martagon lilies, orchids, snowdrops and erythronium. And for those who like the cool air, they can go to the Grotte de la Jaquette cave near the path.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 5.98 mi
  • ◔
    Average duration: 3h 45 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,115 ft
  • ↘
    Descent: - 1,125 ft

  • ▲
    Highest point: 2,910 ft
  • ▼
    Lowest point: 2,077 ft

Photos

Description of the walk

A car park has recently been built just before the cemetery,

(S/E) Take the small tarmac path that climbs up opposite the car park,

(1) After 210 m, turn right towards “Bois de Morgue” (sign). Follow the path to the D94 road.

(2) Cross the road and follow the path opposite for 135 m. You’ll rejoin the D94 road; follow it to the right for just under 200 m.

(3) Leave the road and take the path on the right (blue signposting).
At the first fork, the blue signposts direct you to turn right.

(4) You’ll come to a wide path; turn right, then you’ll see the blue signpost shortly afterwards – follow it towards “Chanaux”. Ignore the adjacent paths.

(5) Turn right onto a wide, gravel path towards “Plateau des Charmilles”,

(6) Follow this wide path. When you reach a junction where four paths meet, take the one on the left, towards “Lompnas” (still following the blue markings). The path is then somewhat overgrown for a few hundred metres but remains passable,

(7) If you wish to visit the cave, at the point where large white stones lie across the path and another to the right of the path, head left into the woods (the path is clearly visible in the woods, but a GPS or Visorando app with the route track is recommended); a very narrow path winds through the woods, which you follow to the cave (see the note in the practical information section).
Take care as you approach the cave; the path becomes very narrow and there is a risk of slipping (not recommended for children).

(8) A beautiful cave (prehistoric dwelling) where a narrow passage cuts deep into the rock, where the temperature is freezing (torches essential).
A few bats may take flight when you arrive. At the end of the descent into the cave, you can climb the smooth, slippery rock in front of you, followed by a narrow, low passageway in the rock, to reach a beautiful and fairly large cave with stunning, highly reflective stalactites and stalagmites. This second section, which is lower and narrower, is more beautiful than the initial descent.
Follow the same route back to the main path

(7) Continue your walk by turning left.

(9) Turn left onto the path (signposted ‘Caution: cliffs’) which descends through the woods to the top of a cliff. Caution: do not get too close to the edge.
On your left, enjoy a sweeping view of the villages of Marchand and Cerin. Far below, on the horizon, the snow-capped Alps can be seen. On your right, take in a sweeping view towards the Bugey and Lyonnais plains.

(10) Retrace your steps along the same path back to the signpost.

(9) Turn left (signposted ‘Lompnas’),
The very narrow, steep and stony path descends for about 700 metres.
At the end of the descent, you’ll come to a wide path; turn right onto it.
At the next junction, carry on straight ahead.
At the next junction, turn left onto the path that descends back to the village of Lompnas, your starting point

(11) When you reach the entrance to the village, turn right to reach the car park (A/D).

Waypoints

  1. S/E : mi 0 - alt. 2,129 ft - Car park before the Lompnas cemetery
  2. 1 : mi 0.16 - alt. 2,175 ft - Turn right towards Bois de Morgue
  3. 2 : mi 0.67 - alt. 2,434 ft - Crossing the D94
  4. 3 : mi 0.86 - alt. 2,539 ft - On the right, a path signposted in blue
  5. 4 : mi 1.13 - alt. 2,684 ft - On the right, a wide path
  6. 5 : mi 2.06 - alt. 2,864 ft - Marker 32 towards the Plateau des Charmilles
  7. 6 : mi 2.94 - alt. 2,910 ft - Turn right onto the stony path
  8. 7 : mi 3.71 - alt. 2,805 ft - Head to the cave
  9. 8 : mi 3.94 - alt. 2,582 ft - Grotte de la Jaquette
  10. 9 : mi 4.36 - alt. 2,694 ft - Sign: ‘Caution: cliffs’
  11. 10 : mi 4.47 - alt. 2,661 ft - Viewpoint
  12. 11 : mi 5.58 - alt. 2,083 ft - Village entrance
  13. S/E : mi 5.98 - alt. 2,133 ft - Car park in front of Lompnas cemetery

Notes

The walk is marked in blue and is fairly well signposted.
Even in dry weather, make sure you wear good walking boots (the path is very stony on the way back).

NOTE: It is advisable to have a GPS or the Visorando app with the route map to get to the Grotte de la Jaquette. Take care as you approach the cave, as the path is very narrow and can be slippery....

Worth a visit

Along the path, in June/July, there are several patches of martagon lilies (a protected species – do not pick them) and, depending on the season, numerous species of orchids (also protected species).
The Grotte de la Jaquette is a very pretty cave where traces of prehistoric habitation have been discovered.
Nearby:
- Pérouges: 40 km away, the medieval village of Pérouges, listed as one of the ‘Most Beautiful Villages in France’. Immerse yourself in medieval life as you wander through the narrow streets and squares, and sample the famous Bugey galette and Cerdon wine.
- “Eaux Vives” Centre: 20 km away in Sault-Brenaz; for white-water sports enthusiasts, hire canoes, kayaks, hydrospeeds and wetsuits to navigate an artificial torrent on the Rhône and cool off.

Reviews and comments

4.5 / 5
Based on 65 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.6 / 5
Route interest
4.4 / 5
demurger
demurger

In reply to JODH, the path (10) leading to the viewpoint does indeed exist (I took it recently); it’s true that it’s easy to miss it as it’s a very narrow track that heads down to the left into the woods, and without a GPS it’s not straightforward.... To access the second cave, you need to be in a pair, as one person can brace against the other’s feet whilst they climb the slab, which is indeed smooth and rather slippery.
GD

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jojoDH
jojoDH

Overall rating : 3.7 / 5

Date of your route : Aug 18, 2026
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Further to the comment posted earlier today.
I can confirm that the ‘Caution: Cliff’ sign is missing, but on looking back at the OSMRando base map rather than the topographical map, a dotted line can be seen showing a path running more or less parallel to the route. It presumably leads to the viewpoint.

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jojoDH
jojoDH

Overall rating : 3.7 / 5

Date of your route : Aug 18, 2026
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

The detour to the cave is well worth it. However, access to the ‘big cave’ is impossible without the right kit. There is a large, smooth, damp slab and no rough patches on the walls.
The route to and from viewpoint 10 – a lovely spot – doesn’t exist, let alone the cliff sign.
There used to be a path a little further back, but it veers away from the marked route.

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Héritier
Héritier

Overall rating : 5 / 5

Date of your route : Oct 16, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

I've done this hike three times: once to scout it out, once with a club (both times going in the direction indicated), and the last time with another club going in the opposite direction, which I preferred because you start with an uphill climb (a short steep section that can be difficult and slippery on the way down in wet weather) and finish with an easy downhill walk. I love the Charmilles plateau, which is perfect for stopping and having a picnic (I saw some deer there). The viewpoint is worth seeing but a little hidden by the trees, and you find yourself very close to the cliffs, so be careful. The cave is not that difficult to find if you have a map and a GPS. Apart from at the start of the woodcut, the path is marked but not signposted. In wet weather, there may be a slightly tricky section at the edge of the cliffs. We managed to photograph a bat in the cave. The hike is very pleasant. Be careful between points 7 and 6, as there is no network coverage.

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Hervebu
Hervebu

Overall rating : 4.3 / 5

Date of your route : Jul 31, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful, varied walk with no difficulties.
Access to the cave is no problem, at least in dry weather. With the app, it's easy to find, although it's a bit hidden in the brambles.

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Vodo
Vodo

Overall rating : 4 / 5

Date of your route : Mar 03, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Easy route to follow with the app. The cave and the view are a bonus. Pleasant hike.

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kizonette
kizonette

Overall rating : 4 / 5

Date of your route : Feb 07, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

A pleasant tour starting from Lompnas!
The cave is a must-see and a wonderful discovery.
I'd love to come back in a different season.
Thank you for this tour.

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lerouveau
lerouveau

Overall rating : 4 / 5

Date of your route : Dec 09, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Beautiful route, very well signposted except for the cave. To access it, descend the deforested section and turn left, following the path trodden by walkers.

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Guyane38
Guyane38

Overall rating : 4 / 5

Date of your route : Aug 30, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

The pretty village of Lompnas with clearly marked departure point.
Good signposting all along the route.
The plateau des charmilles is huge and exudes calm. There were no other hikers apart from me, which suited me fine.
I couldn't find the Jacquette cave because the area was overgrown with cut trees.
There is a pretty viewpoint, but it is quite dangerous as it overlooks the valley. Be careful with children and dogs.
It took me 2 hours and 45 minutes to complete the circuit without running.

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drager
drager

Hi
So the path is passable because at one point it was lost in the ferns.

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Brunther
Brunther

Overall rating : 4.7 / 5

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

Very beautiful and easy hike. Superb view at 10. We didn't find the cave, but we didn't look very hard either. Didn't meet anyone, as is often the case in the Bugey.

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heidi74150
heidi74150

Overall rating : 3.7 / 5

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

A beautiful plateau... well marked... difficult to find the cave... without GPS... but with the IGN map... we managed to find it with some difficulty because there was a lot of wood cutting... which sometimes hid the path... very interesting cave... bring a good torch to visit it...

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virojojo
virojojo

Overall rating : 4.7 / 5

Date of your route : Oct 10, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful hike in the heart of nature on the Charmilles plateau. Well shaded overall. When we reached point 7, we decided not to make the return trip to the cave as there was no visible trail.
After point 9 (and the return trip to the viewpoint), part of the path down to the village is narrow and runs along a steep slope for a few hundred metres. It may require a little more attention, especially with small children, but this is also one of the charms of this hike...

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MARIEFO28
MARIEFO28

Overall rating : 4.3 / 5

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

An easy and pleasant hike through the forest and across this beautiful plateau. The cave is superb, but we didn't dare venture into the second chamber as the rock was really too slippery.
To reach the cave, follow the left side of the forest along the woodcut and you will find the path on the left about 40 metres further on.

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Ulya
Ulya

Overall rating : 4.3 / 5

Date of your route : Sep 01, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

I did this hike in warm weather (1 September) and it was very pleasant because it is almost entirely in the forest, except for the area around and in the village.
To reach the cave, follow the left side of the area where trees have been cut down and you will find the path on the left about 40 metres further on. At the second area where trees have been cut down, the path resumes just opposite the one you arrived on.

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