Noonu Atoll

Noonu Atoll, traditionally Miladhunmadulu Dhekunuburi (South Miladhunmadulu), is a large north-central Maldivian atoll roughly 40 km across containing about 71 islands, 13 of them inhabited, with its capital at Manadhoo. Diving here is split between a handful of luxury resort dive centres — Soneva Jani, Velaa Private Island, Mövenpick Kuredhivaru, The Sun Siyam Iru Veli, Siyam World and others — and northern-route liveaboards that call for a couple of days, so the atoll sees far fewer divers than Baa or Ari and is more of a 'secret' northern stop than a marquee destination. Its signature site is Orimas Thila, a deep thila about 5 km west of Felivaru island that was declared a Protected Area on 16 June 2019: it acts as a grey reef shark cleaning station and nursery where the species can appear in large aggregations (the government listing describes groups of more than a hundred), alongside whitetip reef sharks and zebra ('leopard') sharks. Christmas Tree Rock (Vavathi Kurohli Thila) in the southwest is the other classic — a stepped pinnacle that narrows toward the top like a Christmas tree, draped in soft coral and sheltering resting whitetips — while channel thilas, the small Maafaru shipwreck and outer reef walls round out the menu. Conditions are warm (27–30°C) with visibility usually 10–25 m (clearest, ~30 m, in the dry northeast monsoon); currents run light to strong depending on the site and tide, and the better thila dives are pitched at intermediate-to-advanced divers. Mantas and whale sharks are seen but are not the reliable draw they are at Hanifaru — accounts of timing and frequency differ, so treat Noonu's megafauna as a bonus rather than a guarantee.

• Orimas Thila is Noonu's signature dive and a government-designated Protected Area (declared 16 June 2019, 46.10 ha): a deep thila about 5 km west of Felivaru that functions as a grey reef shark cleaning station and nursery, where the species can gather in large numbers — the official listing describes grey reef sharks 'in groups of more than a 100' — alongside whitetip reef sharks and zebra (leopard) sharks.
• Operators bill Orimas Thila as the 'grey reef shark capital' of the atoll, where seeing 20 or more sharks on a dive is not uncommon — from juveniles under a metre to adults of 3–4 m. Divers settle on a sandy patch down-current to watch the sharks patrol; the site drops past the 30 m Maldivian recreational limit, so depth is managed carefully.
• Christmas Tree Rock (Vavathi Kurohli Thila), in the southwest of the lagoon, is the atoll's second classic: a submerged pinnacle that steps down in widening ledges 'like ornaments' from a narrow top, draped in soft coral and famous for the abundant coral life, with whitetip reef sharks resting in its crevices by day and marble rays under the base ledge.