Blue Magic (officially Fiabacet reef) is Raja Ampat's premier site for large pelagics — wobbegong sharks, oceanic mantas, hammerheads, and giant trevally all appear with regularity. The reef wall drops from 12 m to the open abyss, and experienced divers can drift along it watching for hammerheads hunting in the blue below. The site demands strong current experience and a confident hover in open water.
Chumphon Pinnacle is Koh Tao's most celebrated dive site — a cluster of granite pinnacles rising from 36 m to about 14 m with a resident school of massive chevron barracuda, whale sharks in season, and large grouper. Strong currents keep the water clear and the marine life dense, so advanced buoyancy skills are essential. It is accessible only by boat and sits about 13 km from Koh Tao's west coast.
Dori seamount off São Miguel island is a hard-coral-encrusted pinnacle famous among Azorean dive guides as the best shark dive in the archipelago away from the famous outer banks. Common blue sharks circle inquisitively at 20–40 m while sperm whale pods occasionally pass deeper below, and the abundant macro life on the seamount top includes large nudibranchs and colourful sea slugs rare elsewhere in the North Atlantic. Best dived from a RIB in calm summer conditions.
Elephant Head Rock (Hin Pousar) is one of the Similan Islands' most dynamic sites, consisting of a jumble of massive granite boulders that form swim-throughs, gullies, and archways between 5 m and 30 m. Strong swirling currents bring pelagics including barracuda, tuna, and reef sharks, while the sheltered crevices hide enormous sea fans and juvenile fish life. It rewards exploratory, relaxed diving from multiple angles.
Formigas (Ants) is a tiny, remote islet east of Santa Maria in the Azores surrounded by a broad rocky bank rising from 300 m to just 17 m below the surface. Between April and October the bank is reliably visited by whale sharks attracted by the summer plankton blooms, alongside large schools of amberjack, barracuda, and hammerheads. The Azorean sea temperature at 20–23°C and Atlantic clarity combine to make this one of Europe's finest open-ocean dive experiences.
Gladden Spit is the site of one of the ocean's most extraordinary spectacles: each year between March and June, on the nights of the full moon, hundreds of cubera and dog snapper gather to spawn in a feeding frenzy that attracts whale sharks up to 15 m in length. Divers descend to 20–30 m in the blue water and watch the giants filter-feeding on the spawn clouds, an experience that has no equivalent anywhere else in the Caribbean. Only permitted certified divers with licensed guides may dive the site.
Located on the outer reef of South Malé Atoll, this channel is a renowned manta ray cleaning station where reef mantas gather in impressive numbers to have parasites removed by resident cleaner wrasse. Divers kneel on a sandy ledge at around 12 m and watch mantas pirouette overhead repeatedly, sometimes for 45 minutes. The site is best visited between November and April when the northeast monsoon brings plankton-rich water.
Princess Alice Bank is a mid-Atlantic seamount rising from 2000 m to within 40 m of the surface near Faial in the Azores, considered one of the world's elite big-animal dive sites. Seasonal aggregations of blue sharks, mako sharks, hammerhead sharks, and huge schools of Atlantic amberjack gather above the summit, with blue marlin and whale shark encounters adding to the spectacle in summer. The site is current-swept and remote, demanding open-water confidence and liveaboard access.
Sail Rock is a dramatic vertical granite pinnacle rising from 40 m to 10 m above the sea surface between Koh Tao and Koh Phangan, famous for its vertical chimney running through the rock and predictable whale shark sightings from January to May. Enormous schools of fusiliers and jacks circle the pinnacle while bull sharks patrol the depths. It offers perhaps the best single-dive experience in the Gulf of Thailand.