Nosy Be : dive sites, seasons & whale sharks (2025 Guide)

Planning Nosy Be? This guide covers the real seasons, where to dive by level, the whale-shark window, currents and ethics—field-tested in the Indian Ocean. Need tailored advice? I reply within 24–48h.

Explore Nosy Be diving with underwater photographer Serge Melesan: Sakatia, Tanikely, Mitsio and Radama. Real seasons, whale sharks (Sep–Dec), mantas, dolphins, coral gardens. Safety, currents and ethical encounters. Field-tested advice for scuba travel, conservation stories and fine art collectors.

Nosy Be, the pearl of the Indian Ocean, is an unmissable diving destination for underwater enthusiasts. Located off the northwest coast of Madagascar, this island is home to exceptional sites where marine biodiversity thrives in spectacular settings.

A Forest of Gorgonians: A Stunning Underwater Landscape​
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One of the most impressive sights in Nosy Be is undoubtedly the vast expanse of its gorgonians. These fan corals, often compared to underwater trees, majestically spread across deep reefs. Unlike other diving destinations where gorgonians are of modest size, those in Nosy Be reach extraordinary proportions, creating an almost surreal landscape. Every dive through these gigantic structures feels like swimming through an underwater forest, a sanctuary for countless species of fish and invertebrates.

Nosy Be on the beach

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Nosy Be — whale-shark window (Sep–Dec). Gentle reefs at Sakatia & Tanikely; expeditions to Mitsio & Radama. © Serge Melesan

Encounter with the Juvenile Whale Shark​ :  

Nosy Be is also one of the rare places in the world where juvenile whale sharks can be observed. These ocean giants, still young, peacefully roam the island’s plankton-rich waters. Unlike adult whale sharks often seen in other regions, those in Nosy Be typically measure between 4 and 8 meters and tend to be more playful, offering divers unforgettable encounters. The best season to observe them is generally from September to December when they come to feed in these nutrient-rich waters.
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While this encounter is exceptional, it is best experienced through diving, where a small group can truly appreciate the beauty of this giant in a respectful and non-intrusive way. Unfortunately, mass tourism has led to situations where more than five boats, each carrying 12 eager tourists, converge on a single whale shark, turning the experience into a chaotic chase for the perfect Instagram shot. A better regulation of boat activity and stricter guidelines on whale shark interactions would greatly enhance the quality of observations while ensuring the well-being of these magnificent creatures.

The Mysterious Guitar Shark

Another fascinating inhabitant of Nosy Be’s seabed is the guitar shark. This rare and discreet species, appearing as a cross between a shark and a ray, blends perfectly into the sandy lagoons and coral bottoms. Its distinctive appearance and placid behavior make it an intriguing encounter for experienced divers. Not aggressive but difficult to spot, the guitar shark is a hidden gem of Nosy Be, requiring patience and a keen eye to find.

​The Elusive Omura’s Whale

Nosy Be is also one of the few places in the world where the elusive Omura’s whale can be observed. This whale species, still little known to scientists, moves discreetly through Madagascar’s waters. Unlike the larger humpback whales, Omura’s whale is smaller, measuring between 10 and 12 meters, and exhibits more elusive behavior.

​It is distinguished by its slender silhouette and asymmetrical head markings. The species was named after Japanese cetologist Hideo Omura, who significantly contributed to marine mammal research. Observing one is a rare privilege, making each encounter even more precious for cetacean enthusiasts and researchers striving to learn more about this enigmatic species.

​An Exceptional Biodiversity​
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Beyond these emblematic species, Nosy Be boasts an incredible variety of marine life: manta rays, pygmy seahorses, leaf scorpionfish, sea turtles, and a multitude of brightly colored nudibranchs populate its reefs and dramatic drop-offs. Every dive holds its share of surprises, making Nosy Be a dream destination for marine life enthusiasts.

Scuba Diving Travel — Nosy Be, Madagascar

Nosy Be is a diver’s paradise in the Mozambique Channel, where encounters with whale sharks, manta rays, and sea turtles are part of the adventure. Coral gardens and drop-offs shelter a remarkable variety of marine species, making every dive a unique experience. Serge Melesan’s fine art photography brings the underwater beauty of Nosy Be to life, blending artistic vision with conservation storytelling.

Discover more ocean destinations: Mayotte | French Polynesia | Bahamas

A Fragile Ecosystem to Protect

While Nosy Be is a paradise for divers, it is crucial to emphasize the importance of its conservation. Responsible tourism and coral reef protection are essential to ensuring the longevity of this unique ecosystem. Several local initiatives, such as marine protected areas and diver awareness campaigns, aim to minimize human impact on this natural wonder.
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Nosy Be remains an extraordinary destination where nature expresses itself in all its splendor. Diving into its waters is like entering another world—one where wild beauty reigns supreme, and each immersion unveils a new treasure from the depths.

Nosy Be — Frequently Asked Questions

Short, field-tested answers. I don’t sell trips or take commissions — this is straight advice.

When is the best season to dive Nosy Be?

April–December is generally stable. The whale-shark window is ~September–December. January–March can bring wind/rain and lower visibility (cyclonic season).

Which sites suit my level (beginner / intermediate / advanced)?

Sakatia & Tanikely — gentler reefs, great for beginners & macro practice.
Mitsio & Radama — more depth, occasional drifts and bigger life; better for intermediate/advanced with boat logistics.

How to see whale sharks responsibly?

• Go in calm seas, early starts; September–December is the prime window.
• No chasing, one boat at a time; enter the water quietly.
• Stay off the tail line, keep respectful distance; limit time with one animal.
• Brief your skipper/guide on the code of conduct before leaving.

Are currents dangerous in Nosy Be?

Mostly mild to moderate, but plan for drifts. Check incoming/outgoing before each dive, agree on SMB use and pickup plan, avoid down-current zones along walls, and follow the guide’s briefing.

Photo basics for clear water (wide & macro)?

• Wide + dome (reefs/whale sharks): 1/250–1/500 · f/8–f/11 · ISO 200–400; mind the sun angle to reduce backscatter.
• Macro (Sakatia/Tanikely): steady approach, watch surge; consider focus light and modest strobe power.

Can I combine forest & diving in one trip?

Yes. Many travelers pair Nosy Be diving with Andasibe & Pangalanes (forest/wildlife). Optional extension: Sainte-Marie for those who want extra diving/logistics comfort.

Do you book trips or take commissions?

No. I don’t sell trips or take commissions. I provide honest, ethical guidance and reply personally within 24–48h.

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Need tailored Nosy Be advice?

I don’t sell trips or take commissions. I reply personally within 24–48h.

Join the Nosy Be 10-Day Underwater Photography Workshop

Small group, daily dives, in-water coaching, and evening editing with Serge Melesan.

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More places to dive: Mayotte · French Polynesia — Rangiroa vs Fakarava · Bahamas · Baja California