La Mer Blanche near Mousterlin

Behind the Mousterlin Dunes, the Mer Blanche is a small inland sea that fills up with each tide.
The shallow depth of the sand on this foreshore gives the illusion that the sea takes on a whitish colour.
It is a very popular spot for birds: waders, shelducks, egrets, herons...

Details

391807
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 8.46 km
  • ◔
    Average duration: 2h 25 
  • ▲
    Difficulty: Easy

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 9 m
  • ↘
    Descent: - 9 m

  • ▲
    Highest point: 12 m
  • ▼
    Lowest point: 2 m
  • ⚐ Country: France
  • ⚐ District: Fouesnant (29170)
  • ⚑
    Start/End: N 47.855015° / W 4.051532°
  • ❏
    IGN map(s): Ref. 0519ET
  • Hour-by-hour weather

Photos

Description of the walk

Access: From Fouesnant, take the D44 towards Bénodet, passing the Chapelle de Perguet. At the Pont Henvez roundabout, leave the road to Bénodet and take the last exit on the left towards Mousterlin.
After about 600 m, at the Kerler Beach sign, turn right and continue straight on to the car park. This narrow road, with a speed limit of 50 km/h, is busy in summer and in good weather as it leads to the beach and the start of walking trails.

GR®34trail markers (white and red)

(S/E) With your back to the car park, carefully drive back along the access road for about 600 m and turn left onto the first path marked by two boulders.

GR®34(white and red) +PR® (blue) markings

(1) Take this path, leaving Kerouen on your left (theGR® route is inaccurate at this point). Follow a pasture area along a fence on the left, then wooded embankments. You will reach a small road at a barrier.

(2) Turn left and follow this road straight ahead, which leads to a car park (viewpoint over the lagoon). Turn right after the car park and continue along the well-marked path that runs along the bottom of the cove. Pass a developed area (decking) and continue.
Please note that there is a slight discrepancy between the route and the purple line on the map. New paths have been opened that are not yet marked on the maps.

(3) At the crossroads, after a barrier, turn left and continue along the path which continues towards the bottom of the cove, then turn left.

(4) Turn left again to go up the other side of the cove.
Leave a wide path reserved for bicycles and horses on your right. Continue along a large private property clearly marked by a fence. Pass the bird observatory and reach a road near a car park (viewpoint over the Mer Blanche).

Off the marked trail

(5) Cross the car park and follow the edge of the Mer Blanche to reach Beg ar Garrec, skirting around some beautiful properties for about 500 metres. (alternative route, see practical information) At a barrier, turn right into Rue Hent Beg Ar Garrec and you will reach a small road. (If you are unable to follow the coastline due to the tide, follow the road to reach the crossroads directly.

MarkingsGR®34(white and red) +PR® (blue)

(6) When you find the markings, turn left and follow this small country road heading north-east until you reach the first roundabout.

PR® Blue markings

(7) Turn right, leaving theGR®34trail to your left. Continue to the next roundabout, cross it, continue straight ahead and you will reach the recently renovated Saint-Sébastien Chapel.

No markings

(8) Turn right and follow the road that runs alongside a riding centre on the left. Continue to the end of the road, marked by a barrier.

(3) At the crossroads of paths encountered on the way there, leave the bottom of the cove on your right and turn left. At the barrier, follow the path that runs alongside a meadow and reach a small road.

(9) Turn right and follow this road for about 250 metres.

Markings:GR®34(white and red) +PR® (blue)

(2) At the barrier, turn left and follow the same route as on the way there. In this direction, the blue markings (in the opposite direction) are less visible, but there is no problem with the GR® markings.

(1) Continue straight ahead to the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 3 m - Kerler Beach car park
  2. 1 : km 0.59 - alt. 8 m - Path marked by two boulders
  3. 2 : km 1.48 - alt. 8 m - Barrier, fork in the road
  4. 3 : km 2.74 - alt. 3 m - Fork in the road at the crossroads
  5. 4 : km 3.05 - alt. 3 m - On the left, the other side of the cove
  6. 5 : km 3.8 - alt. 3 m - Crossing the car park
  7. 6 : km 4.66 - alt. 5 m - Junction with GR34 + PR Bleu markings
  8. 7 : km 5.35 - alt. 12 m - End of the GR34
  9. 8 : km 5.73 - alt. 12 m - Towards the equestrian centre
  10. 9 : km 6.71 - alt. 11 m - Road junction
  11. S/E : km 8.46 - alt. 3 m - Kerler Beach car park

Notes

There are numerous car parks, but be aware that they fill up quickly in summer.
Shelter is available at the bird observatory.

Please note: between (S/E) and (1), the 600m stretch of small road is very busy in summer and at weekends (access to the beach and popular spots for seaside walks).
Some parts of the route are very popular with cyclists.

Alternative route: at Beg ar Garrec, continue straight on along Anse de Groazguen to reach a small road at a place called Le Goazel. Follow this road to the roundabout at (7).
This passage is only possible at low tide and the ground may remain relatively wet.

Worth a visit

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

4.6 / 5
Based on 15 reviews

Reliability of the description
4.7 / 5
Ease of following the route
4.7 / 5
Route interest
4.4 / 5
FLOCH
FLOCH ★

Thank you for your message.
I’m glad that these walks are bringing joy to groups of walkers.
Visorando has thus achieved its goal.
Kind regards

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Clo_d'Enez Du
Clo_d'Enez Du

Overall rating : 5 / 5

Date of your route : Mar 23, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Hello, Mr Floch.
I recently went on this walk with a group of hikers. Everyone was delighted by what they discovered there: the famous “Mer Blanche” with splendid views of the lagoon (we spotted a grey heron), remarkable buildings (both old and modern), original sculptures, and so on.
To make a 10 km route, we set off from the car park near Kerneuc beach. At the start and on the way back, we walked along the coast on the upper path, enjoying a lovely view of Bénodet on the way out and of Mousterlin on the way back.
I’d like to take this opportunity to thank you for publishing all these lovely walks, providing us with the route details and descriptions.
Kind regards

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SYCO
SYCO

Overall rating : 4.7 / 5

Date of your route : Mar 10, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

a very beautiful walk between the sea and marshes, with wooded sections. There is little tarmac, but the roads are very small and not very busy. Magnificent at low tide, even more so at sunset...

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Queau
Queau

Overall rating : 4.3 / 5

Date of your route : Aug 18, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

This route is very popular with cyclists, which can make it somewhat challenging for walkers. It is a very easy, flat route.

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Cat29
Cat29

Overall rating : 4.3 / 5

Date of your route : Jun 27, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

a lovely, easy walk, but it's a shame that the vegetation often obscures the beautiful view of the foreshore

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FLOCH
FLOCH ★

Thank you for all these details, which I will take into account in the description.
The situation can change quickly.
Kind regards

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Jean-Pierre29
Jean-Pierre29

Overall rating : 4.7 / 5

Date of your route : Mar 04, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hello,
I thoroughly enjoyed this walk this afternoon, especially as there was hardly anyone else on the path, which is obviously very busy during the summer. The weather was grey, but the path along this white sea is very pleasant.
I noted a few points to correct in the description:
(S/E/) The two boulders do not exist at the entrance to the path, which is impossible to miss.
(2) You have to turn in the middle of the car park and not "after the car park".
(3) "After a barrier" can be deleted because there is no barrier.
(2 return) Replace "At the barrier" with "At the crossroads".
These minor details did not prevent me from completing my hike without any problems.
Thank you very much for this wonderful discovery.
Kind regards
Jean-Pierre

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Le chaland qui passe
Le chaland qui passe

Overall rating : 4.7 / 5

Date of your route : Feb 22, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A pleasant and easy route. Best enjoyed out of season: given the number of car parks along the route, it must get quite crowded in summer. But in February, it's absolutely ideal.
The signposting and directions provided by Visorando are clear and easy to follow!

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sylvinette29
sylvinette29

Overall rating : 5 / 5

Date of your route : Nov 11, 2019
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

a very beautiful hike that I did in the opposite direction, ending up at the edge of the white sea
thank you, Mr Floch

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jeanpierre29benodet
jeanpierre29benodet

Overall rating : 4 / 5

Date of your route : May 04, 2019
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good

Lovely walk

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routeduraker
routeduraker

Overall rating : 4 / 5

Date of your route : Aug 23, 2018
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good

very pleasant parish-specific to Brittany walk by the sea. We didn't do the whole thing, but it was very enjoyable. We'll definitely do it again this winter and autumn

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FLOCH
FLOCH ★

Unfortunately, that's not possible, but it's not a big deal.
I also sometimes make mistakes in my messages.
It's harder to spot mistakes on a screen.
Kind regards

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gerard.langlois
gerard.langlois

Hello and thank you for your message.
I am not yet very familiar with this application.
How can I correct my comment (thanks -> fat?)

Thanks in advance

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FLOCH
FLOCH ★

Thank you for your comment.
Visorando does a great job of sharing hiking information.
Keep up the good work.

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gerard.langlois
gerard.langlois

Overall rating : 4.7 / 5

Date of your route : Jun 15, 2018
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good

This morning, the sun was shining brightly. It was the perfect weather for walking under the trees, along the mudflats or on country paths. No difficulties; just the pleasure of contemplating nature. The tide was low, with a coefficient of 101. This made it easier to walk along the seashore.
It was my first outing with a map and a Visorando description. It certainly won't be my last. Well done.

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