Nosy Tanikely
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily, so treat everything here as planning ranges.
Tanikely, a lighthouse islet south of Nosy Be, has been a managed marine reserve for years, and the protection shows the moment you roll in: fish density double anything on the unprotected coast, green and hawksbill turtles grazing at close range, and coral slopes that drop from snorkeler depth to a modest 18 meters. Octopus and lionfish work the boulder edges, nudibranchs speckle the rubble, and batfish escort divers between coral heads. Every dive operator and day-trip dhow on the island comes here, so mornings are sociable, and the reserve fee visibly funds the wardens who keep it worth visiting.
The moment you come for: Madagascar's most reliable reef: turtles, dense fish, easy conditions
Topography: Fringing reef around a lighthouse islet: coral slopes, sand patches, and boulder edges
Current: Protected on most winds; a gentle current sometimes wraps the islet's points.
Know before you splash
Hazards: Day-boat congestion at midday; little else.
Permits & rules: Daily reserve entry fee collected at the island.
Conservation: A fee-funded reserve with no-take rules; guides enforce no-touch and anchor-free mooring.
Who you'll meet
Nudibranchs
Clownfish & Anemonefish
Hawksbill Turtle
Common Reef (Day) Octopus
Green Sea Turtle
Blue-Spotted Ribbontail Ray
Titan Triggerfish
Lionfish
Also recorded nearby
"Charted here" species were listed by our editors from the sources on this page. Counts are GBIF occurrence records: observations logged within about 5 km of the charted position since 1990, matched only against the species in our catalogue. They show what has been seen there, not a promise of what you will see.
For photographers
Wide angle: ★★★★☆ · Macro: ★★★★☆ (editors' 1–5 rating of what this site gives each style of shooting)