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Nosy Tanikely is a small uninhabited island designated as a marine national park, located southwest of Nosy Be in Madagascar. Its protected status has resulted in exceptionally healthy reef growth, including some of the largest gorgonian sea fans in the Indian Ocean. Hawksbill turtles are so abundant that sightings are virtually guaranteed on every dive, and the island's compact size means diverse marine environments are all within a short boat ride.

The best diving season runs from April to November, during the dry season when visibility is highest and seas are calmest. September to January is whale shark season around Nosy Be, adding another potential highlight. The rainy season from December to March brings warmer water but reduced visibility and occasional cyclone activity.

Whale sharks are present in the Nosy Be area from September to January. While sightings are not always at Nosy Tanikely itself, the surrounding waters are part of the whale shark migration route. Dedicated whale shark excursions depart from Nosy Be during the season, and some fortunate divers encounter them around the island's reef during this period.