Kilindoni Whale Shark Grounds
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 — treat everything here as planning ranges.
The waters off Kilindoni host one of the Indian Ocean's most dependable whale shark operations, built on an unusual fact: many of Mafia's juvenile sharks appear resident, feeding on dense plankton in the island's calm lee rather than merely passing through. From roughly October to February they surface-feed within a short boat ride of town, and encounters run as guided snorkels — no scuba, small groups, distance rules, boats at idle. The water is often green with the very plankton that makes the sightings possible, so this is about proximity to a feeding six-meter fish, not gin-clear photographs. Between seasons the sharks remain in the area but feed deeper, and surface sightings largely stop.
The moment you come for: Surface-feeding resident juvenile whale sharks, met on snorkel
Topography: Shallow, plankton-rich coastal water over sand off Kilindoni town
Current: Calm inshore water in the island's lee; encounters happen at the surface.
Know before you splash
Hazards: Boat propellers around surfacing sharks and low visibility in plankton blooms.
Conservation: Follow the code of conduct exactly — three-meter distance, no touching, no flash, limited swimmers per shark; boat strikes are the animals' main local threat.
Who you'll meet
For photographers
Wide angle: ★★★★☆ · Macro: ★☆☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting