On the eastern shoulder of the Bay of Saint-Brieuc, between the red sandstone of Cap d'Erquy and the wild headland of Cap Frehel, sit two harbours that could hardly be less alike. Erquy is a drying fishing port that has been dredging scallops for sixty years and shows no sign of stopping. Saint-Cast, a few miles north-east, is a modern deep-water marina you can enter at any state of the tide. One is all rope, ice and diesel; the other is all pontoon fingers and visitor berths. Cruise this corner of Brittany and you will probably use both, for different reasons.
I rounded Cap Frehel into here on a clearing northwesterly, the cliffs glowing in the late sun, and dropped into Saint-Cast for the night because the tide was wrong for Erquy. That sums up the relationship between the two ports rather neatly.
Erquy: France's scallop capital
Erquy lives and breathes the coquille Saint-Jacques. A fleet of roughly eighty boats works the king-scallop grounds out in the bay, and the port has been one of the most important scallop harbours in Europe since the banks were discovered in 1962. Come in winter and the quay is a wall of dredgers landing their catch; the whole town turns on the season's openings.
For the visiting yachtsman, Erquy is firmly a tidal port. The harbour dries, and you take the ground or pick up one of the limited moorings. The little marina basin around Cap d'Erquy holds only a handful of afloat berths with a single visitor buoy, so this is not a place to plan a guaranteed pontoon night. The capitainerie keeps tide-dependent hours, opening across roughly seven hours around each high water between about 7am and 8pm. Treat Erquy as a daytime lunch stop or a take-the-ground overnight if your boat is happy to dry out, rather than a marina in the modern sense.
What you come for is the place itself. The beach is superb, the seafood is landed metres from where you eat it, and the walk out to Cap d'Erquy through the heath is one of the best on this coast. If your boat can dry out comfortably, the drying out in a Brittany harbour habit unlocks ports like this that pontoon-only sailors sail straight past.
Saint-Cast Port d'Armor: the all-tide marina
Saint-Cast is the practical opposite, and the obvious base for this corner. The marina is a deep-water port with access at all states of the tide, no sill, no gate, no waiting on the height of water. After the tidal arithmetic that governs the rest of the bay, that freedom is a genuine relief.
It is a big marina by Breton standards: around 825 pontoon berths afloat, plus roughly 180 moorings on buoys, with about 50 places set aside for visitors. The harbour office works VHF channel 9, and the facilities are comprehensive, fuel pontoon, pump-out, water, electricity, showers, wifi and a boatyard with a hoist for the technical jobs. People who cruise this coast routinely call it one of the best harbours between Cherbourg and Brest, and I would not argue.
Because you can enter at any tide, Saint-Cast is the natural bolt-hole when the sills at the other bay ports have shut you out. Beaten the gate at Binic and Dahouet? Run up here instead and you are guaranteed a way in. That reliability is worth a great deal when the weather turns or your timing slips.
Pilotage around the capes
The approaches here are dominated by two headlands and the tide that sweeps round them. Cap Frehel, with its tall lighthouse and the medieval Fort la Latte just to its east, marks the eastern entrance to the bay. The streams run hard off the cape and off Cap d'Erquy, so plan to round them with the tide under you rather than against, and give the off-lying rocks a sensible berth. In a wind-against-tide situation off Frehel the sea gets up quickly and unpleasantly.
The two ports are only a few miles apart by water, an easy hour or two under sail in normal conditions, so you can lie at Saint-Cast and day-trip across to Erquy on a favourable tide, then come back to a guaranteed berth for the night. That is exactly how I would play it. For the rock-strewn nature of the wider coast, the techniques in pilotage in rock-strewn Brittany carry straight over to these approaches.
The scallop season and buying off the boat
If you can arrange your cruise to pass through here in autumn or winter you will see Erquy at full tilt, but even a summer visit teaches you something about the rhythm of the bay. The coquille Saint-Jacques season in the Bay of Saint-Brieuc is tightly regulated to protect the stock: the boats fish only on permitted days, for limited hours, dredging the beds out in the bay before bringing the catch back to land at Erquy and the other quays. That regulation is why the bay's scallops have a reputation for quality, and why the local economy still revolves around them sixty years after the beds were found.
For the visiting cruiser the practical upshot is simple: this is one of the best places in France to eat scallops, and in season you can often buy them straight off the quay or from the fishmongers a few steps from the harbour. Pair that with the oysters and other shellfish landed all along this coast and you have the makings of a memorable cockpit supper. Even out of the scallop season the seafood here is exceptional, and the harbourside restaurants make the most of it.
Choosing between them
The decision is really about your boat and your priorities.
- Want a guaranteed afloat berth, full facilities, fuel and repairs, with the freedom to come and go at any tide? Saint-Cast, every time.
- Want the working-port atmosphere, the best seafood in the bay and a wild cliff walk, and your boat can dry out or you are happy to lunch and leave? Erquy.
I tend to base at Saint-Cast and visit Erquy, which gives the best of both: a secure home berth and the chance to soak up the fishing harbour without fretting about the falling tide. If you only have time for one, and you are touring rather than dredging scallops, Saint-Cast is the safer choice.
Ashore: beaches, capes and the GR34
What sets this corner apart from the working ports at the head of the bay is the coast itself. The Penthievre shore between the two capes is some of the finest walking in Brittany, and the GR34 coastal footpath, the old customs officers' path, runs right along the clifftops. From Saint-Cast you can walk out towards Fort la Latte and Cap Frehel; from Erquy the path climbs over the red sandstone of the cape itself, through gorse and heath, with the whole bay spread out below. On a clear day the views run right across to the pink granite coast on the far side.
The beaches are a draw in their own right. Saint-Cast has a long sweep of sand that fills with families in August, and there are quieter coves tucked along the headlands for those willing to walk. If you are cruising with children, this stretch is a strong choice: secure marina, safe beaches, easy walks and good ice cream are a combination that keeps everyone happy. It is the kind of place where you tell yourself you will stay one night and end up staying three.
Tying it into the bay
These two close the eastern side of a natural loop around the Bay of Saint-Brieuc. Run anticlockwise and you can take in the working harbour at Saint-Brieuc and Le Legue at the head of the bay, the small ports of Binic and Dahouet on the western shore, and finish on these headland harbours, all within comfortable day-sailing distance of one another. The north Brittany cruising guide sets the whole circuit in its wider context, from the Channel Islands hop to the pink granite coast beyond.
The Bay of Saint-Brieuc is one of those cruising grounds that gives back exactly what you put in. Read the tides, respect the capes, and the pair of Erquy and Saint-Cast will reward you with the full range of what Breton harbours can be, from a centuries-old scallop quay to a marina you can stroll into at any hour of the clock.
