Huvadhoo Atoll (Gaafu)

Huvadhoo Atoll — administratively split into Gaafu Alifu (north) and Gaafu Dhaalu (south) — covers nearly 3,000 km² with more than 230 islands and a lagoon up to 85 m deep, bounded to the north by the 97-km Huvadhoo Kandu (the One-and-a-Half-Degree Channel) and to the south by the Addu Kandu. The diving is built around its kandus: oceanic channels that funnel tide and monsoon current through the atoll rim, concentrating sharks at the entrances. On a clean incoming northeast-monsoon current, the eastern channels produce grey reef sharks in extraordinary numbers — up to 300 reported on a single dive — joined by silvertips, whitetips, silkies, dogtooth tuna, and squadrons of eagle rays, with occasional passes from hammerheads or a tiger shark (the Maldives' reliable tiger-shark site is Fuvahmulah, further south — Huvadhoo encounters are incidental). Between January and April many liveaboards also run night snorkels with whale sharks drawn to plankton gathering in the boats' spotlights in the atoll's northeast. Most divers come on Deep South liveaboard itineraries that cross the One-and-a-Half-Degree and Huvadhoo channels from roughly December to March — advanced trips, with some operators requiring 100 logged dives — while a handful of resorts, including the Pullman Maldives Maamutaa with its PADI Eco Center dive base on Gaafu Alifu, offer day-boat diving across dozens of rarely visited sites. The southwest monsoon (May–November) brings wind, rain, and reduced visibility; the northeast monsoon (December–April) is the prime window.

• Huvadhoo's eastern channels hold the Maldives' densest grey reef shark aggregations: on a clean incoming current divers report up to 300 grey reef sharks on a single dive, with whitetips and silvertips mingling in the schools and visibility exceeding 40 m.
• One of the largest and deepest natural atolls in the world: nearly 3,000 km² with over 230 islands, a lagoon 40 miles across and up to 85 m deep, separated from its neighbours by the 97-km Huvadhoo Kandu (One-and-a-Half-Degree Channel) to the north and the 49-km Addu Kandu to the south.
• The atoll is the heart of the Maldives' 'Deep South' liveaboard season (roughly December–March): itineraries cross the One-and-a-Half-Degree Channel to dive Huvadhoo's channels alongside Fuvahmulah and Addu. These are advanced trips — Emperor Divers requires Advanced Open Water plus 100 logged dives and explicitly runs natural, no-baiting shark encounters.