France protects a lot of its sea, and as a visitor you will sail straight into the middle of it without much warning. The boundaries do not look like anything from the cockpit. There is no fence, no buoyed lane, just water that happens to be illegal to anchor in. Get it wrong in the wrong place and the fine runs to five figures. Get it right and you cruise through some of the finest wildlife water in Europe with a clear conscience.
I have anchored, been turned away from, and occasionally been politely lectured in a fair few of these places. Here is how the French system actually works from a small boat, and where the lines fall.
Four levels of protection, not one
The single biggest mistake visitors make is treating "marine reserve" as one thing. It is a ladder, and where a given patch of water sits on it decides what you can do.
- National parks (parcs nationaux). The strongest. Port-Cros and Porquerolles in the Var is the flagship, created on 14 December 1963 as the first marine national park in Europe. The core has hard rules on anchoring, speed and behaviour.
- National nature reserves (reserves naturelles nationales). Strong, often with seasonal no-go cores. The Sept-Iles off Brittany and Cerbere-Banyuls on the Spanish border are the classic examples.
- Marine nature parks (parcs naturels marins) and Natura 2000 sites. Large, more lightly regulated, more about fishing and habitat than banning yachts outright.
- Posidonia anchoring zones. Not reserves as such, but a parallel system across the Mediterranean that bans anchoring over seagrass and bites every cruiser on the Cote d'Azur.
The practical upshot: the word "reserve" on the chart tells you to slow down and read the detail, not to turn around.
The big ones, and what they actually demand
Cerbere-Banyuls was the first exclusively marine reserve in France, created on 26 February 1974, covering 650 hectares against the Spanish border. It has a strictly protected core where anchoring and fishing are banned outright, and a wider zone with lighter rules. You can sail the area, but you cannot drop the hook in the heart of it.
Port-Cros protects roughly 1,700 hectares of land and 2,900 hectares of sea out to 600 metres from the coast. Anchoring is forbidden in the Passe de Bagaud to protect the Posidonia, and since 2020 there is a managed mooring field, a ZMEL, of 68 ecological buoys, free between 8am and 6pm and chargeable overnight. I cover the practicalities in detail in my notes on Port-Cros National Park mooring; the short version is that you take a buoy, you do not anchor, and you keep your speed down.
Corsica's Scandola, on the wild west coast, is a UNESCO site of around 900 hectares of land and 1,000 hectares of sea where fishing and anchoring are both banned. You can transit and look, slowly, but you cannot stop on your anchor, and in recent years access has been tightened with capped visitor numbers on the tour boats. I have written up the cruising reality in Scandola reserve on the west coast.
The Sept-Iles in Brittany is the largest of the lot since its 2023 extension from 280 hectares to 19,700 hectares, of which only about 80 are dry land. The teeth are in the seasonal core: from 1 April to 31 August a reinforced zone of about 1.3 square kilometres around Ile Rouzic is closed to all users, on the water and ashore, to protect the breeding seabirds. Outside that, you can drift and watch.
The Mediterranean Posidonia problem
If you are cruising the Cote d'Azur or Corsica, the rule that will actually change your day is not a reserve boundary at all. It is the anchoring ban over Posidonia seagrass, which now blankets large parts of the Mediterranean coast. Posidonia is a slow-growing seagrass endemic to the Mediterranean, and it is no minor plant: the meadows are reckoned to shelter close to a quarter of all Mediterranean biodiversity and to anchor the coastline against erosion. An anchor dragged through a meadow tears up plants that take decades to regrow, and the authorities have lost patience.
Since 2019 the prefectoral decrees have steadily closed off seagrass to anchoring, and the no-anchor zones are now drawn on the SHOM charts. The practical effect is that on much of the Riviera you can no longer just drop the hook wherever the bay looks pretty. You anchor on clean sand, you read the chart, and increasingly you take a managed mooring buoy instead. Apps like DONIA exist precisely to show you the seabed so you can tell sand from seagrass before the anchor goes down.
Overlaying all of this in the Mediterranean is the Pelagos sanctuary, an international protected area for marine mammals covering 87,500 square kilometres between France, Italy and Monaco. It was signed on 25 November 1999 and came into force in 2002. Pelagos does not stop you cruising or anchoring, but it is a reminder that the whole northwestern Med is managed water, alive with fin whales and dolphins in summer, and worth treating as the wildlife haven it is.
How to find the lines before you cross them
The boundaries are not optional knowledge. They are marked on the SHOM charts that every yacht in French waters is legally required to carry, and that is the authoritative source. Do not rely on memory or on a friend's anchorage tip from five years ago, because the rules have tightened sharply since 2019.
My on-board routine is simple:
- Check the SHOM chart for the area the night before, looking specifically for reserve boundaries and Posidonia anchoring zones.
- Cross-check on an app such as DONIA in the Med, which overlays the no-anchor zones and shows the seabed, or Navily for crowd-sourced anchorage notes including restrictions.
- When in doubt, call the capitainerie or the park office on VHF or by phone. They would far rather tell you where to go than fine you afterwards.
The fines are real
This is not a wink-and-nudge system any more. Anchoring over protected Posidonia, for boats over 24 metres, can draw fines up to 150,000 euros and even exclusion from French waters. Smaller boats are not exempt; the headline number applies to the big yachts, but anyone caught anchoring inside a hard reserve core can expect to be moved on at best and prosecuted at worst. The state runs checks at sea with authorised agents, and the parks have their own patrol boats.
Up on the Atlantic coast
The Mediterranean gets the headlines, but the Atlantic and Channel coasts have their own network, and it works rather differently. Up here the protection is built around seabirds, seals and tidal habitats rather than seagrass, so the restrictions are more about seasonal no-go cores and landing bans than about where you drop the hook.
The Iroise Sea, between Ouessant and the Pointe du Raz, became France's first marine nature park in 2007 and covers roughly 3,550 square kilometres. It is a vast managed seascape with the largest kelp forests in Europe, a resident pod of bottlenose dolphins and major grey seal haul-outs. A marine nature park is a lighter touch than a national park: you can cruise and anchor across most of it, but within it sit smaller reserves and sensitive zones with their own rules. The seal colonies in particular reward a careful visit, which I cover in seals around the Brittany islands.
The lesson of the Atlantic coast is that "protected" rarely means "off limits" here. It means seasonal, and it means read the detail. A bird island that is closed in May for breeding may be perfectly open to a quiet drift in October. The chart and the season together tell you what you can do.
Cruising reserves the right way
The good news is that the rules and the rewards line up. The places worth protecting are the places worth visiting, and if you behave you get the best of them. Take a mooring buoy where one is offered rather than anchoring. Anchor on sand, never on seagrass or rock. Keep your speed down inside park boundaries, both for wildlife and because there are usually limits. Give breeding colonies a wide berth in season.
The reserves are also where the wildlife concentrates, which is rather the point. The same protected water off Brittany that holds the Sept-Iles gannets is alive with seals around the Brittany islands, and the productive Atlantic shelf that the reserves help safeguard is where you watch for whales in the Bay of Biscay. Protection and spectacle are the same thing here.
Treat the reserve network not as a set of obstacles but as a map of where to look. Carry the right chart, read it before you arrive, take the buoy when it is offered, and you will cruise the best of wild France without ever seeing the inside of a maritime court.
