The first time a grey seal followed my dinghy I genuinely thought I had a problem. A dark head, the size of a labrador's, surfacing twenty feet astern, watching, sinking, surfacing again a little closer. They are nosy animals, and a quiet dinghy among the rocks of a Brittany island is exactly the sort of thing a young seal will come to investigate. Once you know that, half of seal-watching is just being still and letting them get curious.
Brittany is the stronghold of the grey seal in France, and a cruiser threading the islands and reefs of the west and north coasts will see them more reliably than almost any other large wild mammal in the country. Here is where they gather, when to look, and how to watch without driving them off the rocks.
Where the seals are
Two areas hold the bulk of France's grey seals, and both are cruising grounds.
The Molene archipelago, out in the Iroise Sea between Ouessant and the mainland, is the biggest haul-out in France during the summer moult. The count peaked at 288 animals in 2022 and 235 in 2023. It is a maze of low rocks and drying reefs, ideal seal country, and the seals use it year-round rather than just for breeding.
The Sept-Iles, off the pink granite coast in the north, is the other major site, with 195 seals in 2022 and 214 in 2023. What makes the Sept-Iles special is breeding: most of mainland France's grey seal pups are born there, 74 per cent of the national total in 2022 and 71 per cent in 2023, and the colony has been growing fast, by more than 15 per cent a year since 2005. The Molene colony is growing too, at around 7 to 13 per cent a year. France's grey seals are, encouragingly, on the up.
Both sites sit inside protected water, and the Sept-Iles in particular has strict seasonal rules. Before you plan a circuit it is worth understanding how the zones work, which is what my overview of France's marine reserves by boat sets out: which areas ban anchoring, which ban landing, and what time of year the cores close.
When to go
Seals are around all year, but the rhythm of the colony decides what you will see.
- Summer, roughly June to September, is the moult. This is when the most animals haul out together on the rocks, the Molene peak counts come from this season, and a low-water drift past the reefs gives you the best chance of a crowd.
- Autumn and early winter is the pupping season at the Sept-Iles, when white-coated pups are on the rocks. This is the most sensitive time of all and the time to keep your distance most rigorously.
- Year-round, individual seals patrol the channels and reefs, and you will meet curious ones at almost any season.
Tide matters more than season for a single watch. Seals haul out on rocks that cover at high water, so the bottom half of the tide, with the reefs exposed, is when you see them lying out. At high water they are mostly in the sea, where you will see heads rather than bodies.
Watching from the boat
The discipline is the same as for any marine mammal: be a guest, not a threat. A flushed haul-out, where the whole group panics off the rocks into the water, costs the seals energy and can separate pups from mothers. It is the thing to avoid above all.
What works for me:
- Approach slowly and from downwind, and stop well off. Let the boat drift rather than motoring up to the rocks.
- Cut the engine. Seals tolerate a silent drifting boat far better than an engine note close in.
- Hold off a clear margin, well over 100 metres from a haul-out, and let the curious ones come to you. They often will.
- Never get between hauled-out seals and the water, and never between a pup and an adult.
- In pupping season, autumn into winter, give the Sept-Iles rocks an especially wide berth.
A pair of 8x42 binoculars turns distant grey lumps into individual faces, and on a calm day at low water you can spend a happy hour just watching them watch you.
Out in the Iroise
Molene sits in the Iroise Sea, France's first marine nature park, designated in 2007 and covering roughly 3,500 square kilometres of water between Ouessant, Molene and the mainland off the Pointe du Raz. It is a working seascape of fierce tidal streams, kelp forests and reefs, and the seals are only the most visible part of it. The same waters hold the largest kelp beds in Europe, a small resident population of bottlenose dolphins around the Sein and Molene archipelagos, and a seabird community that overlaps with the seals on the same low rocks. For a cruiser it is demanding water, with strong streams through the Chenal du Four and the Fromveur passage, the latter running at well over 7 knots at springs, so you plan your seal-watching around slack water both for the wildlife and for your own safety.
The north coast colony at the Sept-Iles is gentler to reach, a short offshore hop from Perros-Guirec or Ploumanac'h, and the seals there share the rocks with the seabirds in a far more compact area. If you have a settled few days you can take in both, a passage that strings together the two best wildlife grounds in Brittany with a run round the Finistere corner in between.
Numbers across France as a whole are still modest by British or Dutch standards. The national seal network counts the colonies every year, and the totals run to a few hundred grey seals at the main sites rather than the thousands you would find on a Scottish island. That scarcity is part of why the protection is taken so seriously, and why a respectful distance matters more here than in places where seals are two a penny.
Reading the rocks
Telling a hauled-out seal from a rock is its own small skill. Look for the banana shape, head and tail lifted, belly down, that grey seals adopt when they are comfortable on a drying ledge. Scan the tide line of low reefs at half tide and you will start to pick them out. A head in the water with a Roman-nosed profile is a grey seal; the smaller, rounder-faced harbour seal is far scarcer in Brittany and more a creature of the Baie de Somme to the north.
A day among the islands
Seals are rarely the only wildlife you will meet on these grounds, which is part of what makes a Brittany island circuit so good. The same Sept-Iles rocks that hold the seal colony carry the Sept-Iles gannet colony and the last mainland puffins, so a single anchorage can give you seals at low water and seabirds all day. The wider seabird picture down the coast is worth a separate trip, which I cover in birdwatching the French Atlantic islands by boat, and on a still warm night these same dark island anchorages are among the better places to catch the glow of the bioluminescence anchorages of France.
The grey seals of Brittany are a conservation success you can watch from your own cockpit. Pick the bottom of the tide, drift in quietly, hold off the rocks, and let the curious ones come and look you over. They almost always do.
