Travel guide
Nantes-Brest Canal: route guide
Allow 8–12 days to cycle the full 360 km (224 mi) Nantes–Brest route at 40–60 km (25–37 mi) a day, or 4–6 days for the middle Pontivy–Guerlédan stretch. Do it May–June or September for quiet towpaths and open services; skip the Brest–Châteaulin leg by train, since the canal proper stops at Châteaulin.Allow 8–12 days to cycle the full 224 mi (360 km) Nantes–Brest route at 25–37 mi (40–60 km) a day, or 4–6 days for the middle Pontivy–Guerlédan stretch. Do it May–June or September for quiet towpaths and open services; skip the Brest–Châteaulin leg by train, since the canal proper stops at Châteaulin.
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Key facts
- Full route length
- About 360 km of canal and linked rivers between Nantes and Brest (check)
- Cycling time
- 8–12 days at 40–60 km a day; 4–6 days for Pontivy–Guerlédan
- Walking time
- 3–4 weeks for the whole route
- Best months
- May–June and September; July–August is busiest and driest
- Surface
- Old towpaths, mostly flat; the Brest–Châteaulin leg uses country roads
- Bike on trains
- Free on BreizhGo TÉR trains; €1 reserved spot June–September (check)
- Rail gaps
- Redon–Carhaix is about 200 km with no working rail service; coaches to Pontivy and Ploërmel may refuse bikes (check)
- Through-navigation
- Not possible: the Guerlédan dam (1920) cuts the canal; boats and kayaks use separate sections
Map and shape of the route
The canal runs west–east across Brittany, linking Nantes on the Loire with the interior at Redon, Pontivy, Carhaix-Plouguer and Châteaulin. It is not one dug channel: engineers joined and canalised the Erdre, Blavet, Aulne and other rivers with locks, so the character changes every day or two.
Contrary to the name, the canal does not reach Brest. West of Châteaulin it becomes a tidal river running into the Roadstead of Brest. Boats can use that water, but there is no official towpath route, so cyclists and walkers cover the last 50 km on country roads. Most people take the TÉR train from Brest or Quimper to Châteaulin instead.
A dam built near Guerlédan in 1920 created the lake of the same name and cut the through-route for boats. Kayaks and small craft now work individual sections; cyclists and hikers still have a continuous path along most of the line.
A large part of the route coincides with EuroVelo 1, the long-distance Atlantic cycling route, so signage is good and the towpath is shared with local riders.
Stages
Distances below are approximate canal-side figures; the Brest–Châteaulin leg is on roads and adds climbing. Towns with train stations are Nantes, Nort-sur-Erdre, Redon, Carhaix-Plouguer, Châteaulin and Brest, which makes them the natural break points.
| Stage | Distance | Time (bike) | Notes |
|---|---|---|---|
| Nantes → Nort-sur-Erdre | 30 km | 2–3 h | Flat, follows the Erdre; easy first day |
| Nort-sur-Erdre → Redon | 55 km | 4–5 h | Quiet locks, few services mid-stage |
| Redon → Pontivy | 70 km | 5–6 h | Longest gap; stock up in Redon |
| Pontivy → Guerlédan | 40 km | 3–4 h | Best scenery; lake beaches at the end |
| Guerlédan → Carhaix-Plouguer | 45 km | 3–4 h | Rolling, some road sections |
| Carhaix-Plouguer → Châteaulin | 60 km | 4–5 h | Nantes–Brest canal proper ends here |
| Châteaulin → Brest | 50 km | 4–5 h | Roads only, no official towpath; train is easier |
Times assume a loaded touring bike at 12–15 km/h with stops; walkers should allow 3–4 weeks for the whole line.
When to go
May, June and September give the best mix: long daylight, towpaths that are not yet crowded, and most cafés, lock-keepers' stops and campsites open. July and August are warmest and busiest, and the canal can be low, which matters if you plan to hire a boat.
Winter is possible on a bike but services thin out sharply and some hire bases close. Spring rain makes the towpath muddy in the wooded sections around Guerlédan.
- May–June: quiet, green, all services open
- July–August: warmest, busiest, boat hire at full capacity
- September: quiet again, water levels still usable
- October–April: many hire bases and campsites closed (check)
Where to stay
The route is rural, so you sleep in the towns on the line rather than beside the water. Nantes, Redon, Pontivy, Carhaix-Plouguer and Châteaulin have the widest choice of hotels, chambres d'hôtes and hostels, plus restaurants and shops for the next day's food.
Between those hubs, expect campsites, gîtes and small guesthouses near locks and villages; some are seasonal. Book ahead in July and August, and again around the Guerlédan lake, where demand from French holidaymakers is high.
Wild camping is not permitted along the canal; use designated campsites or ask at farms and gîtes. If you are boating, moorings are usually free or cheap at locks and village halts (check).
- Nantes: full city range, good for a first or last night
- Redon: rail junction, useful mid-route base
- Pontivy: best placed for the Guerlédan stretch
- Carhaix-Plouguer: rail link, limited beds, book early
- Châteaulin: end of the canal proper, train to Brest
Preparation
Take your bike on BreizhGo TÉR trains in Brittany to reach a start point; carriage is free, but between June and September you reserve a space for €1. Tickets are sold on the SNCF Connect app and the regional TER site, in French.
The 200 km between Redon and Carhaix has no working rail service. Coaches run to Pontivy and Ploërmel, just off the canal, but whether they carry a bike depends on how it is packed and on the driver, so plan a fallback.
Carry water, a repair kit and mosquito repellent. Stagnant sections of the canal breed insects, and summer can bring algae blooms, so avoid swimming where the water is still or green; use the designated beaches on Lake Guerlédan, which is deep in places.
This is rural Brittany, so the usual city safety concerns do not apply. The main risks are falling in, sun, and running out of food between towns.
- Bike reservation on TÉR trains: €1, June–September (check)
- No rail service Redon–Carhaix; coaches may refuse unpacked bikes (check)
- Carry 2 litres of water per person between towns
- Insect repellent and glasses for evening riding
- Check algae warnings before swimming in summer
Questions people ask
How long does Nantes-Brest Canal take?
Cyclists need 8–12 days for the full Nantes–Brest line at 40–60 km a day, or 4–6 days for the middle Pontivy–Guerlédan stretch. Walkers should allow 3–4 weeks. Boats cannot do the whole route because the Guerlédan dam cuts it.
When is the best time to do Nantes-Brest Canal?
May, June and September: long days, quieter towpaths and most services open. July and August are warmest but busiest, and low water can limit boat hire. Many hire bases and campsites close from October to April.
Where should I stay along Nantes-Brest Canal?
Base yourself in the towns on the line: Nantes, Redon, Pontivy, Carhaix-Plouguer and Châteaulin have the most beds and food. Between them, use campsites, gîtes and lock-side guesthouses. Book ahead in July and August, especially near Lake Guerlédan.
Does the canal actually reach Brest?
No. The canal proper ends at Châteaulin. West of there it becomes a tidal river into the Roadstead of Brest, navigable by boat but without an official towpath, so cyclists and walkers use country roads or take the TÉR train.
Can I take my bike on the train in Brittany?
Yes. Bikes travel free on BreizhGo TÉR trains, but from June to September you must reserve a space for €1. Tickets are on the SNCF Connect app and the regional TER site, which is in French.
Can I cycle the whole canal without a rail gap?
The towpath is continuous for most of the line, but the 200 km between Redon and Carhaix has no working rail service if you need a bail-out. Coaches to Pontivy and Ploërmel may or may not carry bikes.
Deep dive
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