Île aux Pies and Vallée de l'Oust

Discover the Oust Valley and the Nantes-Brest Canal, near Redon, and Bains-sur-Oust with this circular route that combines towpaths, forest paths and communal roads.
A few high points will give you a magnificent view of Île aux Pies and the Oust Valley.

Details

136214
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 19.02 mi
  • ◔
    Average duration: 9h 20 
  • ▲
    Difficulty: Difficult

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 719 ft
  • ↘
    Descent: - 719 ft

  • ▲
    Highest point: 220 ft
  • ▼
    Lowest point: 7 ft
  • ⚐ Country: France
  • ⚐ City: Redon (35600)
  • ⚑
    Start/End: N 47.664076° / W 2.088918°
  • ❏
    IGN map(s): Ref. 1020SB, 1021E, 1120SB, 1121SB
  • Hour-by-hour weather

Photos

Description of the walk

Start and finish at Bois de Bahurel, in Redon. This hike largely follows theGR®347on the way there and theGR® 38 on the way back (white and red markings in both cases).

(S/E) Follow theGR®347trail towards Saint-Perreux (west). Turn right onto a path above the Nantes-Brest Canal on your left. This leads to a small road, which you follow to the left. At the next junction, turn left at an acute angle and, after about 100 metres, you will reach the edge of the Nantes-Brest Canal. (Take care when crossing the road, as there is no pedestrian crossing).

(1) Turn right at a sharp angle and follow the towpath with the canal on your left.

(2) At La Potinais, cross a bridge and you will reach the confluence of the canal and the River Oust. Turn north and leave the river behind to reach Chapelle Saint-Méen.

(3) Turn left onto a path just after the chapel and keep the Oust on your left.

(4) Reach the Rocher viewpoint and enjoy the view!
Head back down the forest paths towards the campsite and the L'Île aux Pies beach bar.
You can stop for a picnic or a hot meal at a reasonable price (open only during the summer season).

Continue north-west, keeping the Oust on your left. Pass Île aux Pies, cross the Ruisseau de la Bataille and then turn east. Reach the hamlet of Port Corbin and turn left, heading north, onto the D60 (be careful, this is a busy road and the verges are not very wide). Cross the Pont de l'Aff bridge and you will find yourself on the D149. Follow this road, which branches off to the left, to the Château de Sourdéac.

(5) About 100 m after the château, take the path on the left and continue with the Aff on your left until you reach the Glénac pier.

:6:: Continue west and, after about 100 metres, leave theGR® 347, continuing straight ahead (west) with the Oust on your left to reach the Pont de Branféré bridge, which crosses the Oust.

(7) Cross the bridge and continue along this road towards the south-west, cross the Nantes-Brest Canal (8), continue straight ahead and, 100 metres further on, at the next crossroads, rejoin theGR®38trail. Turn left and follow theGR®38eastwards, staying above the canal. After descending and climbing back up to cross a stream, you will come to a small road which you follow to the left.

(9) Leave this road after less than 1 km to take a forest path that climbs to the right. Continue east with the Nantes-Brest Canal on your left until it meets the Oust, and you will see Île aux Pies. Turn south-east and rejoin the towpath at the via ferrata/tree climbing site.

(10) Continue south on the towpath. Leave the towpath before the small bridge (11) and take the forest path on the right.

(12) After crossing Ti Kendalc'h, take the road to the left and then turn left towards Boro.

(13). Cross the village and take the road on the left to rejoin the towpath and continue southwards along it with the Oust on your left. You will reach the Potinais Dam.

(14) From the dam, continue along the Oust on your left until you reach the underside of the D164 bridge (Redon/Saint-Vincent-sur-Oust road).

(15) Go up onto the bridge and turn left until you reach the Courée roundabout, which you will see in front of you.

(16) Cross the roundabout, continue straight ahead, go up Rue de l'Ermitage and at the end turn left onto Rue de Bahurel. You will reach the starting point (S/E).

Waypoints

  1. S/E : mi 0 - alt. 207 ft - Bois de Bahurel - start and finish
  2. 1 : mi 1.19 - alt. 23 ft - Canal de Nantes à Brest
  3. 2 : mi 2.97 - alt. 16 ft - Bridge at La Potinais
  4. 3 : mi 4.06 - alt. 46 ft - St Méen Chapel
  5. 4 : mi 5.84 - alt. 13 ft - Paillote
  6. 5 : mi 8.06 - alt. 46 ft - Sourdéac Castle
  7. 6 : mi 8.83 - alt. 16 ft - Glénac pier
  8. 7 : mi 10.44 - alt. 26 ft - Branféré Bridge - Oust (rivière)
  9. 8 : mi 10.7 - alt. 16 ft - Nantes-Brest canal bridge
  10. 9 : mi 11.94 - alt. 16 ft - Fork under La Provotaie
  11. 10 : mi 13.89 - alt. 20 ft - Tree climbing
  12. 11 : mi 14.29 - alt. 10 ft - Do not go beyond the bridge.
  13. 12 : mi 14.59 - alt. 118 ft - Ti Kendalc'h
  14. 13 : mi 14.99 - alt. 69 ft - Boro
  15. 14 : mi 16.12 - alt. 16 ft - La Potinais dam
  16. 15 : mi 18.1 - alt. 10 ft - Pont D 164
  17. 16 : mi 18.4 - alt. 26 ft - Courée roundabout
  18. S/E : mi 19.02 - alt. 207 ft - Bois de Bahurel

Notes

Toilets and seasonal catering available at the Île aux Pies beach hut.

There is an alternative route for exploring these landscapes over a shorter distance:

(3) You can start from the bridge at La Potinais. Follow the route as described above until you return to the Potinais dam (15). Cross the dam to reach and cross the bridge at the starting point (3).

Worth a visit

Chapelle Saint-Méen.
View of Île aux Pies in Bains-sur-Oust (4).
Picnic break at the Île aux Pies beach hut (5).
Tree climbing/Via Ferrata (11).

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 7 reviews

Reliability of the description
4.9 / 5
Ease of following the route
4.9 / 5
Route interest
4.3 / 5
domivasseur2935
domivasseur2935
• Edited:

Overall rating : 5 / 5

Date of your route : Mar 21, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent hike *** with two fairly steep sections. Food and drink available in season at La Potinais, Île aux Pies and the climbing/canoeing/treetop adventure site. Muddy conditions along the Rio de la Borde. Several picnic spots and toilets. We cut the route short at La Potinais = ‘only’ 21 kilometres.

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Tommyy
Tommyy

Overall rating : 4.3 / 5

Date of your route : Nov 15, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A high-quality hike, 6 hours at a good pace with enjoyable breaks.
Be careful in autumn/winter, though. It's doable, but I strongly recommend waterproof shoes. The Oust river easily overflows, creating marshy conditions with mandatory passages through the water for about a hundred metres. (Or you can bypass the route, which is fairly easy.)
A hike that I recommend for intermediate walkers looking for a bit of a challenge.

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Johnny Dynamite
Johnny Dynamite
• Edited:

Overall rating : 5 / 5

Date of your route : Nov 10, 2019
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

Done as a trail run, duration 3 hours.
Very nice route, note that the entire section along the Oust was flooded (knowing the area, this must be the case all winter). You can bypass this by taking the small roads and passing through Glenac if you are looking for a nice restaurant.
Good route to do with children on bikes, given the low elevation gain except for 2-3 sections.

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phacent
phacent

Overall rating : 4.7 / 5

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

An interesting hike completed in 7 hours (including a picnic) despite the rain at the end of the route.
Walking time should be considered relative to each person's hiking ability
Monotonous section along the canal, but quickly forgotten once you enter the forest...

Please note:
Sections near Iles aux Pies flooded by the Oust river, which has made itself at home (from point 6 to point 7).
The map is accurate enough to find an alternative route... phew!

Phacent

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beinj
beinj

Overall rating : 4.7 / 5

Date of your route : Jul 14, 2017
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good

A pleasant walk, although a little dull at the beginning and end (a long, flat stretch along the canal with little to see) with a little too much road for my liking.
Also note that the beach hut is closed this summer.
The view from Le Rocher is definitely the most beautiful part of the hike.

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Julien-Lina
Julien-Lina

Thank you very much for this comment.

It's an excellent idea to get in touch with the FFR trail markers! Indeed, the markings are missing or illegible in some places.
I ran the circular route again yesterday and each time I think to myself how lucky I am to know the route...
I had to search quite a bit the first time I did it when I created this route.

I look forward to seeing you on the trail!

Julien

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Hector ship
Hector ship

Overall rating : 4.3 / 5

Date of your route : Apr 06, 2017
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good

Hello.
Hike completed in 6 hours 30 minutes (29.5 km). Beautiful circular route, I'll have to do it again on a mountain bike...
I started "backwards", from St Perreux.
It's a beautiful walk that I recommend. Medium difficulty.
BUT:
- quite a lot of road between 10 and 8, then around 7.
- Excellent signposting between 1 and 8. I'll have to do the other part again, especially towards Ti'kendal.
I'm contacting the FFR trail markers today to do this with them.

Christophe

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Fsifsi
Fsifsi

Overall rating : 4.7 / 5

Date of your route : Apr 09, 2016
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good

A two-day circular route.
Starting from the campsite in Bains-sur-Oust (between 5 and 6), I spent the night at the Le Painfaut campsite in St Vincent sur Oust, roughly halfway around the complete circular route (normally closed, but I had asked by email and they opened a mobile home for me to use the toilet and shower; really friendly welcome!).
It's a shame that the GR38 sometimes sticks to the road rather than following the canal. The trail follows the road a lot, but it's still interesting for those looking for a physical challenge. Very wet area at this time of year (April) after stage 6 (water up to your ankles!).
I finished my hike at what I consider to be the most beautiful viewpoint: Le Rocher, a wonderful reward at the end of the trail!
Thank you for this beautiful hiking trail.
Fsifsi

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