Silhouette Island: Hiking, History, & Untouched Beauty in the Seychelles

Silhouette Island rises out of the Indian Ocean about 20 kilometres north of Mahé, its peak, Mount Dauban, the second-highest in the Seychelles at 740 metres. Roughly 93% of the island is designated as a national park, and it’s encircled by a protected marine reserve. This isn’t a place for casual day-trippers — the single eco-resort, Hilton Seychelles Labriz, operates under strict environmental protocols, and the only way in is a 45-minute boat transfer or an expensive helicopter charter. What you get in return is access to one of the most biologically significant islands in the Indian Ocean, where critically endangered species cling to survival and the hiking trails cut through a landscape that feels genuinely prehistoric.

Silhouette’s 20.1 square kilometres shelter fewer than 200 permanent residents, most of them dedicated to conservation work. The Island Conservation Society (ICS), founded in the Seychelles in 2001, runs multiple research stations here, tracking everything from the critically endangered Seychelles sheath-tailed bat to endemic giant millipedes that exist nowhere else on the planet. For travellers willing to trade resort entertainment for genuine ecological immersion, this island delivers something increasingly rare: a place where tourism actively supports species survival.

Orientation: The Wild Heart of the Seychelles

Silhouette sits apart from the rest of the granitic islands in more ways than geography.

While the other granitic islands in the Seychelles are made of rock dating back roughly 750 million years, much of Silhouette is composed of younger syenite dated to around 63 million years ago. Geologists believe the island may have been born in a dramatic volcanic eruption similar to Mount St Helens in 1980, and at one time it may have towered over 3,000 metres. The crater, now almost entirely eroded and submerged, likely lies southeast of La Passe. That violent origin story explains the steep, jagged terrain you’ll be hiking through — this isn’t a gentle island of rolling hills.

Getting around means walking or taking resort transport along the wide tracks originally laid by the Dauban family in the 19th century to move plantation produce. There are no cars, no roads connecting to the outside world, and no second resort to wander over to. The isolation is the point. I spent an afternoon walking the track from La Passe toward Anse Lascar, past wild groves of mango and rose apple, and the quiet was the kind that makes you stop talking just to listen to it.

Hiking, History, and the Grande Barbe Trail

The main event on Silhouette is the hike to Grande Barbe, and it earns every bit of its reputation.

Grande Barbe: The Island’s Most Challenging Trail

The steep, sweaty hike from the resort to Grande Barbe is four miles long one-way, climbing over a mountainous crest before dropping down to an isolated beach. It’s the island’s most difficult trail, and many travellers turn back — the jungle has been known to deal out injuries and exhaustion to the uninitiated. The payoff is a cove home to a dozen wild Aldabra giant tortoises, which is a strong incentive to push through the fatigue. The trail passes endemic latanier palms, bulging jackfruits, and tangled vanilla vines, and a good guide will crack open tamarind like a monkey nut and peel cinnamon bark so you can understand the smells of the jungle. You’ll spot fat millipedes, skink lizards, and spiky-limbed palm spiders suspended in gossamer webs along the way.

Gran Kaz and the Dauban Plantation Era

At the heart of the island’s human history stands Gran Kaz, a museum and restaurant set in the ‘big house’ belonging to Silhouette’s 19th- and 20th-century plantation owners, the Daubans. The Dauban family bought the island in 1860 and owned it for a hundred years, clearing forest on the flat land to plant coconut palms and fruit trees. At the peak of the island’s industry, as many as 1,500 people lived and toiled here farming coconuts, vanilla, and cinnamon. Tragically, little is documented about the lives of the African slaves who worked the plantation — the population slowly petered out after abolition in the 1830s. The Dauban mausoleum still stands on the island, a quiet monument to a complicated legacy. The island’s name itself wasn’t drawn from its imposing outline but was given in supplication to Étienne de Silhouette, Controller General of Finances in France during the reign of Louis XV.

Beach Patrols and Turtle Monitoring

Between October and March, critically endangered hawksbill sea turtles come ashore to nest on Silhouette’s beaches. The ICS team leads beach patrols that guests can join, monitoring nesting activity and collecting debris — on one patrol, natural debris piled up like funeral pyres yielded beer bottles, sea glass, flip-flops, and fishing nets weighing 287lbs in total. The beaches of Anse Patates and Anse Lascar are the primary nesting sites, and the patrols are a tangible way to contribute to the island’s conservation work. At dusk, fruit bats with 3-foot wingspans swoop overhead as the resort serves dinner — a daily reminder that this island belongs to its wildlife first.

Practical Planning: Timing, Access, and Logistics

Silhouette demands more planning than a typical Seychelles beach stop, and the season you choose makes a real difference.

Best Time to Visit

May through September offers optimal conditions for both terrestrial and marine species observation, coinciding with the active research seasons. July falls within the optimal dry season when turtle nesting peaks and bat activity intensifies. Morning forest walks reveal endemic species most active during cooler temperatures, while afternoon snorkelling sessions in car-free marine sanctuaries showcase healthy coral systems increasingly rare throughout the tropics. The trade winds stir up the Indian Ocean during this period, so the crossing from Mahé can be choppy — something to factor in if you’re prone to seasickness.

Getting There and Getting Around

Visitors arrive via 45-minute boat transfers from Mahé or expensive helicopter charters. The single landing point is La Passe, where a jetty was built during the plantation era and still serves as the main entry. No roads connect Silhouette to the outside world — once you’re here, you’re here. The resort provides transport along the wide plantation tracks, but most exploration is done on foot. If you’re planning to hike Grande Barbe, start early — the heat builds fast, and the trail offers little shade once you’re above the tree line.

Costs and Accommodation

The single eco-resort, Hilton Seychelles Labriz, operates under strict environmental protocols that limit guest numbers and mandate conservation participation. This isn’t a budget option — room rates reflect the isolation, the environmental overhead, and the fact that everything is shipped in by boat. For travellers watching their spending, a day trip from Mahé is technically possible but logistically tight given the 45-minute ferry each way and the limited time to hike before the return crossing. If you’re looking for more affordable Seychelles experiences, the main island offers plenty of options that don’t require this level of commitment.

On the Ground: What to Know Before You Go

Silhouette operates on its own rhythm, and a few practical realities will make or break your trip.

Packing for the Jungle and the Reef

The terrain demands proper footwear — the trails are uneven, muddy in sections, and steep. A pair of sturdy hiking shoes with good grip is non-negotiable for the Grande Barbe hike. For the marine side, a reef-safe mineral sunscreen is essential; the marine reserve is protected, and standard chemical sunscreens damage the coral systems the ICS team is working to restore. Snorkelling gear is available at the resort, but if you prefer your own fit, pack a snorkel set for adults or a kids snorkel set if you’re travelling with children. A dry bag is useful for the boat crossing — the trade winds can kick up spray, and you don’t want your camera or phone soaked before you even arrive.

Conservation Etiquette

The Island Conservation Society operates multiple research stations across Silhouette’s terrain, from sea-level coral monitoring posts to cloud forest laboratories on Mont Dauban. These facilities track the Seychelles sheath-tailed bat — critically endangered with its largest remaining population found only here — alongside endemic giant millipedes that exist nowhere else on the planet. Four endemic fern species cling to existence with single-digit populations. When hiking, stay on marked trails. The resort naturalists, many holding advanced degrees in tropical ecology, lead small groups through the national park interior, and these walks aren’t typical nature tours — participants witness active research, from bat monitoring stations to coral restoration plots. If you’re interested in the science behind the scenery, ask about joining a BRUV (Baited Remote Underwater Video) session, where researchers capture footage of reef sharks, rays, and grouper species that have vanished from heavily fished waters elsewhere.

Food and Local Life

The resort handles all dining, and the menu draws on the plantation history — expect coconut, vanilla, and cinnamon appearing in both savoury and sweet dishes. For a deeper sense of the island’s past, Gran Kaz serves as both museum and restaurant, and it’s worth an afternoon to understand the scale of the Dauban operation. The staff houses built during the plantation era still stand near La Passe, and the wide tracks laid to transport produce now serve as the island’s main walking routes. There’s no local market, no street food, no independent cafes — Silhouette is a single-resort island, and that’s the trade-off for its isolation.

Silhouette Island Visitor Questions

Is Silhouette Island worth visiting for a day trip from Mahé?

Technically possible, but I wouldn’t recommend it. The ferry takes 45 minutes each way, and the Grande Barbe hike alone needs four to five hours. You’d spend most of your day in transit or rushing. A minimum of two nights gives you time for one major hike, a beach patrol, and a proper look at the conservation work.

The resort requires advance booking even for day visitors, and the ferry schedule is limited. If you’re short on time, consider Curieuse Island instead — it’s easier to reach and still offers giant tortoises and a national park setting.

What wildlife can I expect to see on Silhouette?

Wild Aldabra giant tortoises on Grande Barbe beach, critically endangered hawksbill sea turtles nesting between October and March, fruit bats with 3-foot wingspans at dusk, and endemic giant millipedes found nowhere else on Earth. The Seychelles sheath-tailed bat, critically endangered with its largest remaining population here, is tracked by acoustic monitoring systems — you won’t see them easily, but the researchers can show you the data.

The marine reserve holds reef sharks, rays, and grouper species that have disappeared from heavily fished waters. The snorkelling is good, but the real draw is understanding how intact ecosystems function when they’re properly protected.

How difficult is the Grande Barbe hike?

It’s the island’s most challenging trail, four miles one-way over a mountainous crest through dense jungle. Many travellers turn back. The heat, humidity, and uneven terrain combine to make it harder than the distance suggests. You need proper hiking shoes, at least two litres of water, and a guide from the resort.

The payoff is a beach with a dozen wild giant tortoises, but the trail demands respect. If you’re not a confident hiker, the shorter walks around Anse Lascar and Anse Patates offer plenty of wildlife without the risk of injury or exhaustion.

What’s the accommodation like on Silhouette?

There’s one option: Hilton Seychelles Labriz, an eco-resort that operates under strict environmental protocols limiting guest numbers. Rooms are comfortable but not ultra-luxurious — the focus is on the natural environment, not the thread count. Rates are high because everything arrives by boat and the conservation overhead is built into the price.

The trade-off is access to research stations and naturalist guides that no other Seychelles resort offers. If you’re looking for a more budget-friendly Seychelles stay, the main island of Mahé has a wider range of options, and you can still visit Silhouette for a day.

When is the best time to visit Silhouette?

May through September offers the best conditions for hiking and wildlife observation. July falls within the dry season when turtle nesting peaks and bat activity intensifies. The trade winds make the ferry crossing choppier, but the cooler temperatures make the Grande Barbe hike more manageable.

October to March brings more humidity and rain, but the island is greener and quieter. Hawksbill nesting happens during this period, so if turtles are your priority, the wetter months are actually better. There’s no bad season — just different trade-offs between comfort and wildlife activity.

Sources and further reading

Walking with the sunshine protectors of Seychelles’ Silhouette Island. National Geographic, 2024.

The Secret Seychelles Island Where 200 Scientists Guard Species Found Nowhere Else on Earth. Journée Mondiale, 2024.

Silhouette Island. Island Development Company, Seychelles.