Across the water from the ramparts of Saint-Malo, the resort town of Dinard looks back at the old corsair city with the slightly smug air of somewhere that has always been more fashionable. For the visiting cruiser, though, Dinard is really the gateway to one of the best-kept secrets in north Brittany: the Rance estuary, a tidal river you can lock into and cruise all the way up to the medieval town of Dinan. It is a different world from the open coast, sheltered, green and almost Mediterranean on a hot afternoon, and it begins at a power station.
I had read about the Rance barrage for years before I finally locked through it. Like a lot of cruisers, I had treated the Saint-Malo and Dinard pool as the end of the road and never gone further. That was a mistake. The river beyond the barrage is some of the loveliest inland-feeling sailing in France, and you reach it through a lock built into the world's first major tidal power station.
Dinard: moorings, not a marina
Let us clear up one thing first. Dinard does not have a conventional marina with pontoon fingers in the way Saint-Malo does. What it has is a quay with fuel, water, electricity and a slipway, and a field of mooring buoys off the town in the Prieure bay area, a little under a mile and a half up the estuary on the left bank. The Yacht Club de Dinard, founded back in 1928 and famous for the Cowes to Dinard race, runs the sailing scene here, but visiting yachts generally lie on a buoy rather than alongside.
That suits the place. Dinard is somewhere you visit for the Belle Epoque villas, the beaches and the views back to Saint-Malo, not somewhere you settle a big boat for a week of jobs. For full marina facilities most cruisers base in Saint-Malo and treat Dinard as a short hop across the pool. The detailed run-down in the Saint-Malo and Rance marina guide covers the locked basins on the city side, which are the practical home berth for exploring this whole estuary.
The barrage: locking into the river
The Rance tidal power station closes the estuary about three miles above Saint-Malo, and it is the gate to everything upstream. Built in the 1960s, it still generates electricity from the rise and fall of one of the largest tidal ranges in Europe, where springs can exceed 12 metres. A road carries the D168 across the top of the dam, and a lock on the left-bank side lets boats through.
The lock chamber measures roughly 65 by 13 metres, so it swallows anything a cruising yacht is likely to be. It works to set times that depend on the tide and the road-bridge openings, so you have to plan your transit around the schedule rather than turn up on spec. Call the barrage on VHF channel 13 to confirm the next opening and to be sequenced through. Inside, you secure to the lock walls as the water equalises, then motor out into a different river entirely, still tidal but tamed, with currents driven as much by the power station's turbines as by the moon.
Get the timing right and the transit is a relaxed twenty minutes. Get it wrong and you wait for the next slot, so check the day's openings before you leave your berth. The whole exercise is good practice if you have not done much lock work, and the principles transfer straight to the how a French lock works routine you will meet again and again if you ever head for the canals.
Up the river: Plouer, Lyvet and Dinan
Above the barrage the Rance opens into a series of wide, wooded reaches dotted with small marinas, and this is where the estuary earns its reputation. Plouer-sur-Rance has a small marina with about ten visitor berths, generally on pontoon B, and the staff there are a good source of barrage information; you can raise them on VHF channel 9. It dries outside its own gate, so check the access state.
Further up, at the head of the maritime river just below the Chatelier lock, Lyvet has a small marina with moorings for around 25 boats, with water, electricity and showers. The Chatelier lock itself measures about 30.8 by 8 metres and works on demand within set hours; beyond it the river becomes the canalised waterway that runs up to the old quays of Dinan, one of the most beautiful medieval towns in Brittany and a worthy destination for a yacht that can take its mast or has a low enough air draught.
For a leisurely few days, treat the river as its own cruise. A slow cruise of the Rance and the Cotes-d'Armor is the kind of gentle pottering that this estuary was made for, anchoring in quiet reaches, locking up to Dinan, and dropping back down to the coast when you fancy a blow of sea air.
What the river is actually like
People hear "tidal estuary in Brittany" and picture mud, racing currents and a navigation problem. The Rance above the barrage is nothing of the sort. The power station holds the water back and lets it through on a managed cycle, so the range upstream is compressed compared with the savage tides outside, and the river settles into a series of broad, calm reaches between wooded banks. On a warm afternoon, with the granite warming up and the oaks coming down to the water, it feels closer to a southern French river than to the windswept coast you left a couple of miles back.
That said, it is still tidal and the currents driven by the turbines can be surprisingly strong at certain states, so do not switch your brain off entirely. The upper reaches dry to large mudflats, and the marked channel winds between them, so you keep to the buoyage and watch your depth. Anchoring in the wider pools is one of the great pleasures here; you can lie for a night in near-total quiet, with herons stalking the shallows and barely another boat in sight, and then drop back down to the barrage when you want sea air again. It is a side of Brittany that most cross-Channel cruisers never see because they treat Saint-Malo as the turning point.
Dinan: the destination at the top
The reward at the head of the river is Dinan, and it justifies the whole excursion. The town sits high above its old port on the canalised river, a perfectly preserved medieval walled town of timber-framed houses, cobbled streets and ramparts you can walk. The old quay below it, where the river meets the start of the Ille-et-Rance canal, has visitor moorings, and a yacht with a lowering mast or modest air draught can lie right under the town. Even if your boat cannot get all the way up, you can take the dinghy or leave her at Lyvet and travel the last stretch, and it is worth the effort.
This is where the maritime Rance meets the inland-waterways network: from Dinan the Ille-et-Rance canal runs on across Brittany towards the Vilaine and the south coast, a route that some cruisers use to cross the peninsula without going round Finistere. That is a bigger undertaking, but standing on the old port at Dinan you can see how the river you have just sailed up is the first link in it.
Practical notes for the Rance
- Dinard: quay with fuel, water and a slipway, plus mooring buoys in the Prieure bay area; no conventional marina, so most visitors base in Saint-Malo.
- Barrage lock: roughly 65 by 13 metres, VHF channel 13, opens to a tide- and bridge-dependent schedule. Check the day's times before leaving.
- Plouer-sur-Rance: about 10 visitor berths, pontoon B, VHF channel 9, dries outside the gate.
- Lyvet: moorings for around 25 boats with water, electricity and showers, just below the Chatelier lock (about 30.8 by 8 metres, on demand within hours).
- Tidal range: springs can top 12 metres, so the barrage and the river currents both demand respect.
The Rance is the antidote to the hard tidal sailing of the open Brittany coast. You lock through one wall and the sea state vanishes, replaced by a green river that winds up to a medieval town. Base yourself across the water, time the barrage, and give yourself a few days to drift up to Dinan and back. It is one of the most rewarding side-trips on the whole north Brittany coast, and it starts at Dinard.
