Megaliths in Trébeurden and the Quellen Marsh

A hike through varied landscapes: seaside, moors, undergrowth, and a marsh rich in biodiversity, which you cross on a specially designed trail. Along the way, you will come across several isolated megaliths.

Details

80670
Creation:
Last update:
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  • Walking
    Activity: Walking
  • ↔
    Distance: 7.68 km
  • ◔
    Average duration: 2h 20 
  • ▲
    Difficulty: Easy

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 60 m
  • ↘
    Descent: - 55 m

  • ▲
    Highest point: 60 m
  • ▼
    Lowest point: 3 m

Photos

Description of the walk

Start at the car park providing access to the Marais du Quellen, located on the right of the D788 when coming from Trébeurdun, just before the youth hostel.

Yellow markings

(S/E) Cross the D788 and follow it to the right. After a few metres, take a smaller road on the left and walk alongside a car park. At the crossroads, turn left and, at the fork that immediately appears, take the right-hand path. After passing the houses on the left, turn left onto a dirt track. This will take you to Toënno beach. Leave the beach quickly by following a track on the right. You will reach the small menhir of Toënno.

(1) Pass the fishmonger's buildings on your right and continue along the shore. Go around a shipyard and continue eastwards along the seafront. Near the road, cross a stream and continue north then north-east.

Red and white markings

(2) At the T-junction, follow theGR®34to the left. You will come out onto the D21 (on the left, access to Ile Grande).

(3) Follow the road to the right.

No markings

(4) After about 100 metres, turn right onto a path between ferns and bushes to reach the Prajou-Menhir covered walkway. Retrace your steps.

Red and white markings

(4) Follow the D21 to the right. At the end, cross the D788 (take care) and first turn left then right to follow a small road towards a campsite. At the crossroads, continue straight ahead (on the left-hand lane).

(5) At the crossroads, turn left onto Chemin de la Chapelle and head towards Penvern Chapel. Retrace your steps.

Yellow markings

(5) Turn left (when returning from the chapel) and head south on the small road that climbs in a series of small bends. The road gives way to a path that passes at the foot of a water tower. Shortly afterwards, at a T-junction, turn right. At another crossroads, turn left.

No markings

(6) Take a path on the left (signpost) towards the Menhir de Milin Ar Lann, which is just a hundred metres away. Retrace your steps.

Yellow markings

(6) Continue along the path on the left (south-west). Descend into a small valley and cross a stream. Climb back up the valley and reach the hamlet of Kerariou (ignore a path on the left). Cross a road and continue north-west downhill.

(7) Turn left onto the Marais du Quellen path. The route alternates between paths on dry land and wooden footbridges over the water. After a wide circular loop that goes around the marsh to the south, you will come out onto the D788. Follow the road to the right and return to the starting point (S/E).

Waypoints

  1. S/E : km 0 - alt. 7 m - Car park providing access to the Marais du Quellen
  2. 1 : km 0.72 - alt. 5 m - Menhir of Toënno
  3. 2 : km 2.17 - alt. 5 m - Junction with the GR34
  4. 3 : km 2.66 - alt. 7 m - Near Ile-Grande
  5. 4 : km 2.77 - alt. 7 m - Access to the - Allée Couverte de Prajou-Menhir
  6. 5 : km 3.94 - alt. 12 m - Access to Penvern Chapel
  7. 6 : km 5.63 - alt. 50 m - Access to the Milin Ar Lann menhir
  8. 7 : km 6.69 - alt. 19 m - Marais du Quellen
  9. S/E : km 7.68 - alt. 7 m - Car park providing access to the Marais du Quellen

Notes

Good sports shoes are required, at a minimum.

A detailed map is useful (at least the one accompanying this description).

No water sources identified along the route. Fishmonger next to the Menhir de Toënno (1): oysters available for purchase and tasting (for a fee) on site.

This hike can be combined with another hike described on Visorando: Tour de l'Ile Grande. At the point (3) of this hike, take the D 21 on the left: after 250 metres at most, cross a bridge and join the starting point of the other hike. Allow 4½ to 5 hours of walking for the whole hike.

The author has completed this hike twice, the first time on 19 July 2000 and the second on 22 July 2003.

Worth a visit

- Marais du Quellen (7), a nature reserve maintained through grazing by Camargue horses.
- Penvern Chapel (14th-17th century).
- Prajou-Menhir covered walkway, which is about fifteen metres long, and a few menhirs along the way.

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 / 5
Based on 16 reviews

Reliability of the description
3.9 / 5
Ease of following the route
3.8 / 5
Route interest
4.2 / 5
User 26563442

Overall rating : 4.3 / 5

Date of your route : Jul 14, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Varied route: sea, paths, marshes.
Just at the beginning, we had a bit of trouble before reaching the shipyard.

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joemarie
joemarie
• Edited:

Overall rating : 4.3 / 5

Date of your route : Jun 14, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk with beautiful scenery. We enjoyed the peace and quiet, listened to the birds and saw Camargue horses.
The route through the marshes is no longer entirely accurate, as the layout on the ground has been changed, probably due to redevelopment (footbridges, etc.). We were unsure at first, but we followed the route on the ground and found the Visorando trail later on.

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Yvon22730
Yvon22730

Overall rating : 4.3 / 5

Date of your route : May 25, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

A lovely walk along the coast, through the countryside and woods, with beautiful views.

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Vincent de Normandie
Vincent de Normandie

Overall rating : 4.3 / 5

Date of your route : Sep 25, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk despite the rainy weather. Exploring the marsh is interesting and beautiful.

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Coucy
Coucy

Overall rating : 4.7 / 5

Date of your route : Apr 08, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

The Quellen Marsh is currently closed.

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Gérard du 57
Gérard du 57

I'm going to Brittany in June. Knowing the area and Brittany, I think it will be a
wonderful trip, as Brittany is so beautiful!
Happy travels to everyone!
Gérard from 57

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Orélie
Orélie

Overall rating : 3.5 / 5

Date of your route : Jul 14, 2023
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

We found it more difficult to follow this route at first, mainly because you really have to keep your eyes glued to your phone to monitor the route on the beach. We had to turn back several times. There is a section where you really have to be careful along the road. It's quite long and there's a lot of traffic because it's the only road leading to Grande Island. But after that, it's a pleasure because the paths are very pleasant, shaded and completely exotic, between sea and land.

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coco68@
coco68@

Overall rating : 4.3 / 5

Date of your route : Aug 20, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Magnificent hike!!!

At the start of the hike, the low tide allowed us to get close to the boats and venture here and there along the shore.
The landscapes are very varied, a real treat for the eyes.
We also had the incredible opportunity to visit Penvern Chapel, which revealed its treasures to us.
Be careful between points 4 and 5, as there is very heavy and fast traffic on the main road, and walking along it is risky.
Then we finished in style at the Marais du Quellen.
Thank you for sharing this hike with us.

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Pascal donard
Pascal donard

Overall rating : 4.3 / 5

Date of your route : Mar 12, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Lovely walk

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Lililapuce
Lililapuce

Overall rating : 4 / 5

Date of your route : Aug 10, 2020
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A pleasant, peaceful route between meadows, heathland and marshes. Be careful though, it's best to do the first part at low tide, as we had to make a challenging crossing to get across a stretch of water.
If you are really interested in the marsh wildlife, I recommend doing the route in reverse, as it ends at the marsh entrance, where there are information boards.

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mamy yoyo
mamy yoyo

Overall rating : 3.3 / 5

Date of your route : Jun 22, 2019
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good

Hello, when I reached the second menhir, I couldn't follow the route because the vegetation had grown back.
I had to go around via the beach to find the path again. Thank you to the author for this route.

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Noise_Buster
Noise_Buster

Overall rating : 4 / 5

Date of your route : Jul 30, 2018
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good

The walk through the Quellen marsh is well worth the trip. The trail is very well laid out and easy for hikers. You will discover lush vegetation.
Note that the Penvern chapel along the route is only open on Saturdays from 2pm to 6pm. It's a shame because we passed by on a Monday and the description of its interior made us want to visit!
The route was combined with a tour of Grande Island. The only downside was the section on the D21, which was full of cars and had a minimal pavement.
The route followed using the GPX track was no problem: the GPX is perfect! It's the best way to hike, as Breton (and French in general) signposting often leaves a lot to be desired, and following the route on a map isn't that easy!

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Bourdon77
Bourdon77

Overall rating : 2.3 / 5

Date of your route : Jul 30, 2018
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★☆☆ Average

We never found the exact route described on the information sheet, and the locals couldn't help us! What a shame.
This time, we only had the written document and not the website!
Near Trebeurden, it wasn't very well signposted!

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harmonobe
harmonobe

Overall rating : 4.7 / 5

Date of your route : Jul 02, 2018
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good

Between the village and moorlands of Landrelec

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ArouG
ArouG

I didn't follow the route as described, but took a different one (passing by the 10 megaliths of Trébeurden, including the magnificent one on Milliau Island!), based on the one that "inspired" me. However, as I receive messages in my email inbox asking for my opinion, I'm sharing it in the hope that I won't receive any more!

P.S. No, due to a lack of time to go through all the selection criteria in order to be published, I won't even try (anymore) to share my route.

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