The GR340 traces the entire 95-kilometre perimeter of Belle-Île-en-Mer, France's largest Atlantic island and one of the most celebrated hiking destinations in Morbihan, southern Brittany. The circuit begins and ends at Le Palais, the island's main port and ferry terminal, and can be walked in five to six days or broken into day sections ranging from 10 to 25 kilometres.
Belle-Île is reached by a 45-minute car ferry from Quiberon on the mainland, operated by Compagnie Océane year-round. The island has no motorway noise or heavy industry, and the coastal path maintains an intimate relationship with the sea throughout. Walkers carry their luggage between overnight stops or use the island's Nominoë bus network to shuttle bags ahead.
The western Côte Sauvage is the most dramatic section: sheer schist cliffs punctuated by sea caves, natural rock arches, and the Aiguilles de Port-Coton — needle-like sea stacks that Claude Monet painted extensively during his 1886 stay on the island. This section requires care in strong winds; paths descend steeply to small beaches at Port-Donnant and Port-Coton, and some narrow ledge sections are signed as one-way in peak season to prevent overcrowding. The surface here is compacted earth and schist rock.
The eastern coast is gentler, passing through the picturesque fishing port of Sauzon (the most-photographed village on the island), Le Palais harbour, and a series of sheltered sandy coves ideal for swimming stops. Elevation is consistently low — the island's interior barely exceeds 60 metres — but cumulative ascent and descent over five days is significant.
Facilities are concentrated in Le Palais and Sauzon; the wilder western coast has minimal services. Walkers should carry 1.5 litres of water on the Côte Sauvage stages. Bike hire is available at Le Palais port for those combining cycling with walking.
Trail facts
- Trail area
- Belle-Île-en-Mer, Morbihan
- Best season
- May–October
What to bring
- Trekking poles (optional)
- Waterproof jacket
- Sunscreen
- 1.5L water (limited facilities on wilder west coast)
Location
Start: Le Palais ferry port, 56360 Belle-Île-en-Mer
47.3456, -3.1445 View on map
Highlights
- Aiguilles de Port-Coton sea-stack rock formations, painted by Claude Monet during his 1886 Belle-Île residency
- Sauzon fishing harbour — painted boat houses, stone quays, and colourful facades make it one of Brittany's most-photographed villages
- Côte Sauvage cliff section: sea caves, natural arches, and sheer schist drops to the Atlantic swell
- Plage des Grands Sables, Belle-Île's longest beach and the ideal midcircuit swimming stop
- Car-free island atmosphere and Gulf Stream microclimate supporting wildflowers that persist well into November
Tips for visiting
- Book the Quiberon–Le Palais ferry well in advance for summer travel; vehicle-deck spaces and foot-passenger capacity both sell out weeks ahead in July–August
- The Côte Sauvage is safest in calm conditions — check Atlantic swell and wind forecasts before committing to the cliff-edge sections
- Sauzon has a small supermarket and restaurant options for resupply midway around the southern circuit
- Use the island Nominoë bus to shorten individual daily stages or to retrieve bags without retracing the route
- Trekking poles reduce knee strain on the steep descents to Côte Sauvage cove beaches
When to visit
May to October is best for the full circuit; June and early July see wildflowers at their peak while avoiding peak-August ferry and accommodation pressures. September offers warm sea temperatures and significantly quieter paths than midsummer.
Accessibility
The GR340 is not accessible to wheelchair or pushchair users. The Côte Sauvage sections involve steep cliff descents and narrow ledge paths. The Le Palais and Sauzon harbour areas have flat pedestrian zones suitable for mobility-impaired visitors; the Le Palais tourist office can advise on accessible shoreline routes.
Frequently asked questions
Can the GR340 circuit be walked without camping?
Yes — Belle-Île has gîtes, hotels, and chambres d'hôtes in Le Palais, Sauzon, Locmaria, and Bangor, which serve as overnight stops for walkers completing the circuit in five to six stages. Advance booking in July–August is essential.
Is it possible to walk just a section of the GR340 in a single day?
Several day sections of 10–18 km are feasible using the island's Nominoë bus for point-to-point walks. The Sauzon to Pointe des Poulains section (around 12 km) is one of the most popular standalone day walks on the island.
Are there water sources on the Côte Sauvage section?
Water sources are absent on the wild western coast between Port-Donnant and Pointe des Poulains. Walkers should carry at least 1.5 litres from Bangor or Le Palais before entering this section.
How frequently does the Quiberon–Le Palais ferry operate?
Compagnie Océane operates the Quiberon–Le Palais route year-round, with crossings every 1–2 hours in peak season (July–August) and reduced frequency in winter. The crossing takes approximately 45 minutes.