Tréglonou - Portsall

A hike along the famous GR®34 coastal path between the bridge over the Aber Benoit, in the commune of Tréglonou, and Portsall, in the commune of Ploudalmézeau. There are magnificent landscapes throughout the route, enhanced by the presence of numerous birds. Along the way, there are opportunities for culinary stops.

This walk is part of a multi-day hike: Les Abers de l'Est : de Guissény à Portsall

Details

n°95151986

Creation:
17 Apr 2026

Last update:
today

Last review:
–

Activity: Walking
Distance: 15.88 mi
Average duration: 7h 35
Difficulty: Difficult
Back to start: No
Ascent: + 292 ft
Descent: - 295 ft
Highest point: 121 ft
Lowest point: -3 ft

Country: France
City: Finistère (29)
Start: N 48.553497° / W 4.535142°
End: N 48.555497° / W 4.699349°
IGN map(s): Ref. 0416ET
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Description of the walk

Start from the car park at the south end of the Tréglonou bridge.

GR®34 markings

(S) Cross the D28 with care and take the path running alongside the Aber Benoit. Continue along the coastal path for 5 km to rejoin the D28S at Carpon.

(1) Take the path on the right, below the D28. Note the Loc Majan Chapel on the left after about 150 m, but it is not open to visitors. Continue along the path to the two bridges over the Garo.

(2) Cross them and follow the path which turns right. It leads onto a road (Impasse de Traon Bihan). Turn right into the woodland. Climb a stony lane and join a track suitable for vehicles.

(3) Take the path on the right for about 200 m and follow the track on the right which descends to the banks of the Aber to reach Porz ar Vilin. On the way back up, take the path on the right to reach Impasse Beg an Menez.

(4) Walk up the street and turn right again onto Rue de l’Aber Benoit, leaving Saint-Tugdual Church higher up on your left. Continue and pass the shipyard on your right. At the second junction, turn left onto Rue du Stellac’h. Then turn right onto Rue de Kertanguy. Follow it straight on and take the path that continues it to reach Rue du Passage.

(5) Continue and, at the junction, take the street on the right and head down towards Ganoac Beach. Pass the CVL yacht club and continue along Rue du Béniguet.

End of GR® markings.

(6) Leave Rue Traon Bouzar on your right. At the next junction, take Rue de Kervigorn on the right, then Rue de la Pointe de Kervigorn on the right. You will rejoin the GR®34 markings at the bottom of the street.

GR®34 markings

After a short stretch on a footpath, rejoin Rue de Corn ar Gazel.

(7) Follow it downhill then turn right to join the GR®34, which runs along the shore. At Pointe de Corn ar Gazel, near the picnic area, take a detour to see the seaweed kiln. Continue on the GR®34 to Ruisseau du Ribl.

(8) Cross the bridge and continue along the GR®34 to Pont ar Bleiz.

(9) Follow the signs to the left indicating the Pont ar Bleiz covered walkway. Head straight on to the covered walkway. Retrace your steps to rejoin the GR®34.

(9) Follow it to the left towards the west. Stay along the coast. Go round the headland of Téven Pen ar Pont. See the seaweed kiln nearby.

(10) At the car park, you can choose to stay on the GR®34 or head down to the beautiful fine-sand beach if the tide allows.

There are no GR® markings on the beach.

Cross the beach by skirting the rocks on the left. At the collapsed bunker, the Flosque stream flows; do not cross it but join the GR®34 on the left.

(11) Resume the GR®34 heading west. Stay on the coast until you see Île Carn, which is easy to spot as it is topped by a cairn.

(12) If the tide allows, it is fairly easy to get there to visit the cairn and two of its chambers. Do not climb the cairn.

(13) Retrace your steps and turn right to rejoin the GR®34 on the right, following it to Porsguen. Leave the path and head right towards the beach. Cross the beach and then follow the GR®34 along the coast to reach Pointe de Penvir.

(14) From the headland, continue along the GR®34 to the Portsall jetty and the Amoco Cadiz anchor. To do this, turn right at the junction. Then keep straight on at the crossroads before turning right at the next one. Keep right all the way to reach the anchor and the jetty.

(15) Retrace your steps back to the crossroads. Then head straight on to Portsall (E).

Waypoints

S : mi 0 - alt. 20 ft - Tréglonou Bridge - aber benoit
1 : mi 3.19 - alt. 16 ft - Le Carpont
2 : mi 3.97 - alt. 16 ft - The Garo
3 : mi 4.33 - alt. 69 ft - Gravel path
4 : mi 5 - alt. 39 ft - Dead end
5 : mi 6.03 - alt. 30 ft - Rue du Passage
6 : mi 6.7 - alt. 105 ft - Rue Traon Bouzar
7 : mi 7.35 - alt. 85 ft - Rue de Korn ar Gazel
8 : mi 8.62 - alt. 36 ft - Path junction and stream
9 : mi 9.39 - alt. 20 ft - Pont ar Bleiz - Allée couverte de Pont-ar-leiz
10 : mi 10.94 - alt. 26 ft - Car park
11 : mi 11.61 - alt. 16 ft - Stream and bunker
12 : mi 12.61 - alt. 33 ft - Opposite Cairn Island
13 : mi 12.92 - alt. 43 ft - Cairn
14 : mi 14.8 - alt. 23 ft - Pointe de Penvir
15 : mi 15.43 - alt. 20 ft - Anchor of the Amoco Cadiz - Ancre an Eor
E : mi 15.88 - alt. 16 ft - Square de l'Arbrec

Notes

Check the weather: the wind can be strong.

Take care when crossing roads.

The route follows the GR®34 trail almost exactly, except in specific cases.

Between (2) and (6): part of the path is closed: you must use the foreshore; check tide times and water levels before crossing.

Worth a visit

Seaweed kilns at Corn ar Gazel and Téven Pen ar Pont.

Cairn on Île Carn.
The earliest structures date back 4,200 years, meaning the site is over 6,000 years old. This tumulus, 30 metres in diameter and 8 metres high, comprises three burial chambers. It was listed as a historic monument in 1955.
The island is accessible only at low tide when the tidal range is at least 80.

The anchor of the Amoco Cadiz, as a memento or to reflect on history.