Nosy Be
Nosy Be, off Madagascar's northwest corner, mixes easy reef diving with a serious seasonal show: from roughly September to December, whale sharks feed in the surrounding channels, often alongside mobula rays and — a global rarity — Omura's whales. The Nosy Tanikely marine reserve delivers turtles and dense small-fish life minutes from shore, green turtles graze the seagrass off Sakatia, and humpbacks fill the winter months. Infrastructure is simple; the biology is not.
ここでダイビングする理由
Nosy Be's calling card is the spring plankton season, when juvenile whale sharks gather to feed in the lee of the island. Encounters run snorkel-style from small boats, frequently sharing water with mobulas, and the same season brings regular sightings of Omura's whale — a species barely known to science until researchers began documenting the population here in the 2010s. Below the surface the year is steadier: Nosy Tanikely, a small island reserve, packs turtles, anemonefish colonies, octopus, and nudibranch-rich rubble into an easy, protected dive and snorkel site; Sakatia's seagrass meadows host grazing green turtles at close range. Visibility is honest rather than heroic, and the far-flung Mitsio and Radama archipelagos reward those who take multi-day trips. July through September adds humpbacks on every crossing. Madagascar asks more logistics than the Maldives or Zanzibar — and repays it with encounters few dive destinations can list at all.
月別
The dry season runs roughly April-November. September-December is the whale shark and Omura's window; July-September brings humpbacks; January-March is cyclone-prone and wet, with reduced operations.
| 月 | 水 | 透明度 | どんな体験か |
|---|---|---|---|
| January●●○○○ | 28–30 °C / 82–86 °F | 8–15 m | Rainy season; storms and reduced visibility. |
| February●●○○○ | 28–30 °C / 82–86 °F | 8–15 m | Wettest month; cyclone risk. |
| March●●●○○ | 28–30 °C / 82–86 °F | 8–18 m | Rains taper. |
| April●●●●○ | 28–30 °C / 82–86 °F | 10–20 m | Drying; calm seas return. |
| May●●●●○ | 27–29 °C / 81–84 °F | 12–25 m | Dry season; settled diving weather. |
| June●●●●○ | 26–28 °C / 79–82 °F | 12–25 m | Cooler and clear; humpbacks arrive. |
| July●●●●○ | 25–27 °C / 77–81 °F | 12–25 m | Humpback season in full swing. |
| August●●●●○ | 25–27 °C / 77–81 °F | 12–25 m | Whales and calm mornings; coolest water. |
| September●●●●● | 25–28 °C / 77–82 °F | 12–25 m | Humpbacks linger; first whale sharks. |
| October●●●●● | 26–29 °C / 79–84 °F | 12–25 m | Whale shark season builds; Omura's whales about. |
| November●●●●● | 27–29 °C / 81–84 °F | 10–20 m | Whale sharks most reliable; warm and calm. |
| December●●●○○ | 28–30 °C / 82–86 °F | 8–18 m | Heat and first rains; whale sharks taper. |
月別データの信頼度: Documented. 行のない月は確認済みデータがありません。不確かな情報を掲載するより、空欄のままにすることを選んでいます。
ダイブサイト (4)
| サイト | タイプ | 水深 | レベル | アクセス | |
|---|---|---|---|---|---|
| Manta Point (Nosy Be) Seasonal chance of mantas at an offshore cleaning bank | Reef | — | Intermediate | Boat | |
| Nosy Be Whale Shark Grounds Snorkel encounters with feeding juvenile whale sharks, mobulas alongside | Blue water | 0–10 m | Beginner | Boat | |
| Nosy Tanikely Madagascar's most reliable reef — turtles, dense fish, easy conditions | Reef | 2–18 m | Beginner | Boat | |
| Sakatia Turtle Grounds Large grazing green turtles at snorkel depth, meters from shore | Shore | 1–8 m | Beginner | Shore |
アクセスと宿泊
アクセス: Fly to Nosy Be via Antananarivo, Réunion, or seasonal regional links; transfers cross the island by road to Ambatoloaka and the west-coast beach bases.
宿泊先: Ambatoloaka and Madirokely concentrate dive operators and nightlife; quieter lodges sit on Sakatia and the northwest beaches.
費用: Diving is reasonably priced; whale shark and whale-watching excursions are sold separately, and marine-reserve fees apply at Tanikely.
ダイビングの合間に: Lokobe reserve's lemurs, ylang-ylang and rum distillery tours, Nosy Komba village visits, sunset dhow sails, and Mont Passot's crater-lake viewpoints.
スノーケリング: Whale shark trips are snorkel-based, Tanikely is a first-class snorkel reserve, and Sakatia's turtle seagrass sits in a few meters of water.
安全性と実用情報
危険生物・リスク: Boat traffic in the whale shark season, tidal currents between islands, and remoteness — medical infrastructure is thin across Madagascar.
Keep encounters to code-of-conduct distances (no touching, no chasing, boats at idle), and dive well within limits given the distance to advanced medical care.
最寄りの再圧タンク施設: No recompression chamber serves Nosy Be; serious cases mean long-distance evacuation — dive conservatively, and emergencies go through local EMS and DAN.