Along the Trieux via the Penhoat woods

Wander along the eastern bank of the Trieux through heathland, pine forests and magnificent viewpoints. You’ll be immersed in its unique historical and natural heritage: Château de la Roche-Jagu, flax drying sheds, steam railway line, Maison de l’Estuaire, and protected flora and fauna.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 17.83 km
  • ◔
    Average duration: 6h 00 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 324 m
  • ↘
    Descent: - 326 m

  • ▲
    Highest point: 96 m
  • ▼
    Lowest point: 4 m
  • ⚐ Country: France
  • ⚐ District: Plourivo (22860)
  • ⚑
    Start/End: N 48.731765° / W 3.119332°
  • ❏
    IGN map(s): Ref. 0814OT, 0815SB
  • Hour-by-hour weather

Photos

Description of the walk

Park in the car park at the Chapelle Saint-Jean.

(S/E) Take the small road on the left which leads down towards the Frinaudour bridge. As you approach the Frinaudour bridge, follow the yellow markings on the right. Walk along the top of the railway line for 100m, then turn right uphill. The path continues along a road.

(1) Then take the path on the left (yellow markings). At the next junction, continue to the left. Follow the Trieux stream above, ignoring the paths branching off to the right. You will come to a road which you follow to the left, passing in front of Coat Ermit and walking alongside the railway line for about fifty metres.

(2) Turn left to cross the railway line, then left again just on the other side. Shortly afterwards, you’ll enjoy a view of the Château de la Roche Jagu. At the junction, you can head down to the riverbank. Then walk back up for about 50 metres and turn left to return to the railway line and cross it.

(2) Continue straight ahead, then at the next junction, turn left onto the path overlooking the Trieux.
After 1 km, at a junction, turn left to cross a stream.

(3) Immediately turn left to go through a tunnel under the railway line. Continue straight ahead, then follow this path as it turns right to run alongside the estuary to the Maison de l’Estuaire (Manoir de Traou-Nez).

(4) Continue straight on to go under the bridge and take the forest road. At the second bend, turn left towards Lancerf (yellow markings). Walk along the heights of the Trieux. Further on, you’ll come to a junction with a wide path.

(5) Follow the path to the left, keeping to the yellow markings, and rejoin the road. Turn left to reach a T-junction.

(6) Ignore the road on the right leading to the chapel; continue straight on down to the railway line, then cross the level crossing.

(7) Continue along the path on the right which runs alongside the estuary to reach Traou Du.

(8) Go under the bridge, then cut across the road and head up, south-southeast. Ignore a path on the left to reach the hamlet of Kericun.

(9) Turn left, then right after the bend, and head uphill through the woods, keeping straight on.

(10) At the junction, turn right to reach Ty Caër. Walk past this house, which is beautifully decorated with flowers, and head down into the valley (yellow markings).

(11) At the junction, continue straight ahead to cross the stream, then head back up to a junction at the end of a small road.

(12) Leave the yellow markings and turn left onto the wide path (partly tarmac) for 200m. At the first junction, turn right (ignoring a path on the left which goes downhill and is blocked by a chain). Follow this path (often muddy and rutted) to the junction with a road.

(13) Take the path opposite for 200m, then veer left and follow the narrow path (somewhat obstructed by branches and holly) which follows a boundary line. After about 400m you come out onto a wide path. Take this on your right and join the road (elevation 79).

(14) Cross the road and take the path opposite (often with deep puddles). Continue, ignoring two paths branching off to the right.

(15) Return to the forest track and the yellow markings, then turn left. After 500m, at the junction, leave the yellow markings again and continue straight ahead.

(16) Join the road and turn left to reach the hamlet of Toul Lan. Take the second small road on the right that goes downhill to reach the Saint-Jean Chapel and the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 75 m - Saint-Jean Chapel - Towards the - Leff (rivière)
  2. 1 : km 1.37 - alt. 49 m - Path on the left
  3. 2 : km 3.38 - alt. 41 m - Crossing the railway line
  4. 3 : km 5.41 - alt. 25 m - Tunnel on the left
  5. 4 : km 6.32 - alt. 18 m - Maison de l'Estuaire - Trieux (fleuve)
  6. 5 : km 7.87 - alt. 80 m - To the left
  7. 6 : km 8.61 - alt. 42 m - Go round the chapel on the left
  8. 7 : km 9.22 - alt. 6 m - Walk along the estuary to the right
  9. 8 : km 10.68 - alt. 6 m - Straight ahead under the bridge
  10. 9 : km 11.43 - alt. 39 m - To the left
  11. 10 : km 12.52 - alt. 76 m - Hamlet of Ty Caër
  12. 11 : km 13.12 - alt. 38 m - Opposite, towards the stream
  13. 12 : km 13.57 - alt. 69 m - Turn left onto the wide path
  14. 13 : km 14.21 - alt. 78 m - Opposite the road
  15. 14 : km 14.85 - alt. 80 m - Opposite the road
  16. 15 : km 15.84 - alt. 90 m - On the left, forest track
  17. 16 : km 17.12 - alt. 96 m - Road, on the left
  18. S/E : km 17.83 - alt. 73 m - Saint-Jean Chapel

Notes

Maison de l'Estuaire: water point and dry toilets

Worth a visit

Reviews and comments

4 / 5
Based on 7 reviews

Reliability of the description
4.3 / 5
Ease of following the route
3.9 / 5
Route interest
3.7 / 5
lozach.pierrick
lozach.pierrick
• Edited:

Overall rating : 3.3 / 5

Date of your route : Jun 08, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : No

This long walk first follows the right bank of the Trieux, descends towards the coastal grasslands and offers a breathtaking view of the Château de La Roche-Jagu, standing majestically on its meander. It then climbs back up to the level of the rarely used railway line, with some beautiful views of the Lédano and the Lezardrieux bridge. The long return to the forest plateau, under the cover of maritime pines, along paths cluttered with branches or quiet little roads, is unusually monotonous. There are no navigation difficulties, provided you check your GPS frequently, as paths, roads and trails criss-cross each other. This walk is best suited to those who enjoy long, quiet hikes.

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Jean Claude 22
Jean Claude 22

Overall rating : 4.3 / 5

Date of your route : Oct 12, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

It’s a lovely walk through the woods of Penhoat-Lancerf, passing by the Manoir de Traou Nez and following the River Trieux; the view of La Roche-Jagu Castle is magnificent, and the end of the walk at Frinaudour, where the two rivers meet, is well worth seeing. We had scouted the route the previous Friday, to show it to our group of walkers the following Thursday; the walk was done in the opposite direction and was very much enjoyed. The first part was done using GPS; once you reach the banks of the Trieux, the on-the-ground navigation is very clear. The weather was sunny and the ground was dry and very easy to walk on. A big plus is doing the hike at high tide (tide information from Lezardrieux). By taking a short detour via the Chapel of Lancerf, the hike covers 18km.

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jmdoutey
jmdoutey

Overall rating : 3 / 5

Date of your route : Mar 20, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★☆☆☆☆ Very disappointing
Very busy route : No

Strongly not recommended, except during periods of severe drought. Whilst the first section, along the Trieux, is not without its charms—particularly the rather charming railway line from point 11 onwards—once you enter the woods, it becomes a real ordeal. The path is completely rutted by tractors and timber lorries; you’ll be wading through 20 to 50 cm of water and mud. Piles of branches left over from tree felling make it impossible to avoid the ruts by walking on the verges.... It took 2 hours 20 minutes to cover the first 10 kilometres, and 3 hours 30 minutes to cover 5 kilometres in the woods.....
It should be noted, in case anyone still wants to give it a go, that at point 6, the path is diverted (+1 km) because protected birds are nesting there, and this will remain the case until 1 June.

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Bretonne22
Bretonne22

Overall rating : 4.7 / 5

Date of your route : Apr 18, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A lovely walk, but a long one. You should take a picnic with you – it’s more fun that way

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grandlouis17357
grandlouis17357

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

A lovely walk, especially the first part along the Trieux.
The return route through the woods is trickier and sometimes a bit muddy.
The path through the woods is a bit tricky to follow.

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Fprouff
Fprouff

Overall rating : 4.7 / 5

Date of your route : May 01, 2018
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

A lovely walk, especially the first section along the Trieux. The return route through the woods can be a bit muddy in places, but it makes for a varied walk overall.

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bibi
bibi ★

Thank you for your feedback; perhaps the author will be able to tell us more.
Kind regards

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yannmarie77
yannmarie77

Overall rating : 3 / 5

Date of your route : Oct 10, 2017
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★☆☆ Average

The first section, from marker 1 to 7, is superb – a breathtaking view with that little railway line running below. Magnificent!!! But from marker 7 onwards, behind the railway line, the route becomes very difficult: there’s no proper path, and much of it is through water! We relied solely on the GPS, and the section through the woods that followed was quite tricky, again using only the GPS. A bit disappointed with the second section.

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