Cannes and the Lérins Islands: what this under-the-radar marine escape reveals

The first time I crossed the Cannes roadstead to reach Sainte-Marguerite, a flock of Yelkouan shearwaters skimmed the surface, revealing a turquoise seabed beneath the hull that wouldn't look out of place in the Caribbean. Few visitors realise that these two islands, less than twenty minutes from the Croisette, shelter one of the last eucalyptus and holm oak forests on the Côte d'Azur coastline, protected under Natura 2000. Between military heritage, coastal trails and clear waters frequented by dolphins and loggerhead turtles in summer, Lérins packs the full richness of Mediterranean marine life into a handful of hectares, just a short boat ride from Cannes harbour.

A wild archipelago right by the Croisette

Sainte-Marguerite and Saint-Honorat form a protected island microcosm, just 15-20 minutes by boat from Cannes harbour. Sainte-Marguerite, the larger of the two, hides Fort Royal within its holm oak and eucalyptus forest, where the mysterious Man in the Iron Mask was once imprisoned. Saint-Honorat, more intimate, still belongs to the Cistercian monks who have grown vines and olives there since the 5th century. Between the two islands and the mainland, the channel offers sheltered waters, ideal for spotting rocky seabeds where white bream, groupers and occasionally shoals of juvenile barracuda gather in late summer. Posidonia seagrass, the underwater meadow essential to oxygenating the Mediterranean, carpets much of the shallow seabed around Saint-Honorat, a habitat classed as a priority under the EU Habitats Directive.

Protected wildlife and flora of the archipelago

The posidonia belt fringing the islands shelters seahorses, long-spined sea urchins and juvenile Mediterranean fish. On land, Aleppo pine and the towering eucalyptus of Sainte-Marguerite, planted in the 19th century, tower over shaded trails roamed by escaped ring-necked parakeets. Offshore, between Lérins and the Var headlands, striped dolphins and occasionally Risso's dolphins pass through in summer, drawn by currents rich in small pelagic fish sweeping in from the Baie des Anges.

Exactly where to go around Cannes and Lérins

The obvious starting point is Cannes harbour, Quai Max Laubeuf, from where regular shuttle boats depart for Sainte-Marguerite (Vieux Port) and Saint-Honorat. On Sainte-Marguerite, the Ferdinand de Lesseps trail loops right around the island in about 2 hours, passing coves such as Pointe du Dragon, perfect for a dip in clear water. Saint-Honorat can be explored via a shorter loop, punctuated by seven monastic chapels and the monks' vineyard. For wider marine wildlife spotting, head to Cap d'Antibes or Pointe Croisette, departure points for boat trips into the Pelagos Sanctuary, the protected zone for cetaceans stretching all the way to Corsica and the Italian Riviera. The calanques of Cap Roux, further west towards Saint-Raphaël, round off the trip perfectly for anyone after even wilder seabeds.

Practical access from the mainland

Shuttle boats run almost hourly in season from Cannes' Vieux Port, with a reduced timetable in winter. Book ahead for July and August, as spaces fill up fast with some operators. The ports of La Napoule and Cros-de-Cagnes also offer occasional connections, handy for varying your starting point and dodging the summer crowds on the Croisette.

When to go to make the most of the archipelago

Spring, from April to June, remains the season favoured by those in the know: the sea warms gradually, the posidonia is in full growth, and the Lérins trails are still quiet before the summer rush. It's also when striped dolphins are most likely to come close to shore, following shoals of anchovies and sardines rising to the surface. Summer, from July to August, brings warm, clear water perfect for swimming, but the islands and shuttle boats get very busy, especially around the 15 August bank holiday. September and early October strike an excellent balance: still-warm water, gorgeous golden light on the ramparts of Fort Royal, and noticeably fewer crowds. Winter, altogether calmer, suits walkers and photographers, with a genuine chance of spotting shearwaters and Mediterranean gulls wintering in the bay. Avoid spells of mistral or strong easterly winds, which make crossings tricky and cloud underwater visibility.

How to plan your marine getaway

A single day is enough to explore one island, but two days are ideal if you want to combine Sainte-Marguerite, Saint-Honorat and a boat trip out to the Pelagos Sanctuary. The trails are accessible to everyone: flat and well marked, they suit families easily. For wildlife watching, choose trips run by accredited operators, particularly those carrying the High Quality Whale Watching label, which guarantees practices respectful of marine life. Pack a mask and snorkel to explore the posidonia meadows, sturdy walking shoes for the forest trails, and reusable sun protection rather than chemical sunscreens harmful to coral and seagrass. Binoculars are also invaluable for spotting seabirds from the rocky headlands.

Recommended kit and timing

Allow half a day per island for a thorough visit on foot, and a full day if you add a boat trip. A light rucksack, water, hat and closed shoes are all you need for the trails. For snorkelling, a simple mask, snorkel and a pair of short fins are enough to explore the coves without heavy kit, while respecting the regulated mooring zones around the protected seagrass meadows.

Practical tips and responsible tourism

The cost of a trip to Lérins mainly depends on the season and the type of outing chosen: a simple shuttle crossing remains good value, while a guided excursion into the Pelagos Sanctuary costs more but guarantees proper scientific supervision. Book your shuttles and boat trips several weeks ahead in July and August, as demand often outstrips supply. When it comes to whale and dolphin watching, ACCOBAMS regulations require a minimum approach distance and reduced speed near the animals; always choose operators carrying the High Quality Whale Watching label, which limit observation time and avoid encircling groups of animals. On land, stick to marked trails to protect the forest regeneration on Sainte-Marguerite, and never anchor over posidonia meadows, recognisable by their dark colour underwater. Take your rubbish home with you, cut down on non-biodegradable sun creams before swimming, and use a reusable water bottle. These simple habits help ensure the archipelago keeps its clear water and understated wildlife for generations to come.

Frequently asked questions

How much time should I set aside to visit the Lérins Islands from Cannes?

A single day lets you explore one island properly, but two days are recommended if you want to combine Sainte-Marguerite, Saint-Honorat and a boat trip. Shuttles from Cannes harbour take 15 to 20 minutes, leaving plenty of time to explore the coastal trails at a relaxed pace.

Can you see dolphins from Cannes or the Lérins Islands?

Yes, striped dolphins regularly frequent the waters between Lérins and the Pelagos Sanctuary, especially in spring and summer. Boat trips run by accredited High Quality Whale Watching operators offer the best chances of a respectful sighting, though nothing is guaranteed since these are wild, free-roaming animals.

Which Lérins island should I choose: Sainte-Marguerite or Saint-Honorat?

Sainte-Marguerite suits families well, with its swimming coves and Fort Royal to explore. Saint-Honorat, quieter and more intimate, appeals to those drawn to monastic heritage and vineyards. Ideally, plan for both islands over two separate half-days to fully enjoy each atmosphere.

Is snorkelling possible around the Lérins Islands?

Yes, several coves such as Pointe du Dragon on Sainte-Marguerite offer clear water well suited to snorkelling, with views over posidonia meadows and various Mediterranean fish. Stick to authorised swimming areas and avoid walking on the seagrass, a protected habitat vital to the marine ecosystem.

What's the best time to visit Lérins and avoid the crowds?

Spring (April-June) and early autumn (September-early October) offer pleasant water temperatures with noticeably fewer visitors than July and August. These periods also guarantee better underwater visibility and generally stable weather for shuttle crossings.

Cannes and the Lérins Islands pack a still-wild slice of the Mediterranean into just a few kilometres: protected forests, posidonia meadows, monastic heritage and dolphins offshore in the Pelagos Sanctuary. Choosing the right season, sticking to the trails and opting for accredited boat trips turns this getaway into an experience that's both unforgettable and responsible. To plan your next marine wildlife trip guided by passionate experts, find our tips and itineraries at dauphin-mediterranee.com.