Cape Kri holds a Guinness World Record for the most fish species counted on a single dive — 374 species in one hour. This submerged point on Kri Island in Raja Ampat is exposed to open-ocean currents that deliver an almost overwhelming concentration of marine life, from metre-long bumphead parrotfish to pygmy seahorses. The dive is typically done as a drift from 5 to 28 m along the reef crest.
Also known as Fish Head, Maaya Thila in the Ari Atoll is a submerged pinnacle that rises steeply from depth and acts as a magnet for grey reef sharks, white-tip reef sharks, and large Napoleon wrasse. Night dives here are particularly spectacular when nurse sharks and octopus come out to hunt. The strong currents that make this an advanced site are also responsible for its exceptional fish density.
The SMS Markgraf is one of the crown jewels of Scapa Flow diving — a German WWI König-class battleship scuttled in 1919, resting upside-down at up to 45 m. Its massive hull, gun turrets, and propellers are now encrusted with soft corals and anemones, making it one of the most impressive wreck dives in the world.
Sunk by German bombers in 1941 while carrying war supplies, the SS Thistlegorm is one of the most historically fascinating and dived wrecks on the planet. Its holds still contain motorcycles, trucks, rifles, and railway wagons, offering a remarkable time-capsule experience at 16–30 m. Strong current is common on the site so drift planning is essential.
The SS Yongala is widely regarded as one of the world's greatest wreck dives. This passenger steamer sank in a cyclone in 1911 and now rests at 14–30 m, completely encrusted with corals and teeming with giant grouper, bull sharks, sea snakes, and manta rays. Strong currents keep the site nutrient-rich and visibility high, but they also demand experience.
The USS Liberty is a US Army cargo ship torpedoed in 1942 and now resting just metres off Tulamben village beach on Bali's northeast coast. Its accessibility — the bow sits at just 5 m and the stern at 30 m — combined with extraordinary marine life including bumphead parrotfish schools at dawn, make it one of the world's most dived wrecks. Night dives reveal sleeping turtles and hunting cuttlefish.
Apo Reef Natural Park is the second-largest contiguous coral reef system in the world and the largest in Asia, located in the Mindoro Strait west of Palawan. The outer reef walls host thresher and hammerhead sharks, schools of bumphead parrotfish, and spectacular wall diving from 5 to 40 m. The park's isolation from intense fishing pressure means fish biomass is dramatically higher than most Philippine reefs.
One of the Maldives' first dive sites to gain international renown, Banana Reef lies just north of Malé and is famous for its curved shape, colourful overhangs, and permanent population of oriental sweetlips and moray eels. Gentle currents make it accessible to divers of most levels, though experienced visitors will appreciate the blue-water pelagics that pass the reef tip. It is a superb introduction to Maldivian reef diving.
Batu Bolong — 'hollow rock' in Bahasa Indonesia — is a small rocky island surrounded by a reef pinnacle so rich with life that it has been called the Komodo region's greatest dive. The walls from 0 to 40 m are completely covered in sea fans, black coral, and soft corals in orange and purple, while the water column above teems with fusiliers, jacks, and hunting reef sharks. Strong unpredictable currents demand experience and a confident drift technique.
Bloody Bay Wall on Little Cayman is one of the Caribbean's most spectacular wall dives, dropping vertically from just 6 m depth to over 1800 m in the Cayman Trench. The wall face is densely covered with black coral trees, sea fans, tube sponges, and barrel sponges, while eagle rays and Nassau grouper cruise the blue water alongside. Crystal-clear visibility averaging 40 m makes this a benchmark for tropical wall diving.
The Blue Hole is a 160 m deep vertical shaft in the reef just north of Dahab, famous worldwide for its intense blue colour and tragic reputation among technical and freediving communities. Recreational divers explore the open 'saddle' at 6 m and the stunning arch passage at 55–60 m that opens to the open sea. Extreme depth, nitrogen narcosis, and the lure to dive deeper make this site genuinely dangerous without proper training.
The Blue Hole at Dwejra on Gozo island is a natural cylindrical hole in the limestone shelf, 10 m in diameter and 15 m deep, that opens through an arch at 8 m into the open Mediterranean. The arch drops to 25 m on the seaward side, connecting to the Azure Window collapse site and a dramatic wall leading to 50 m. The resident date mussels, dusky grouper, and dense moray eel population make it an outstanding Mediterranean dive.
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.
Christmas Point on Similan Island No. 7 is famous for a sloping coral garden that cascades from the surface to 30 m, planted with enormous table corals and staghorn formations. The site is named for a distinctive Christmas-tree-shaped rock that marks the entry point. Leopard sharks rest on sandy patches between boulders, and manta rays visit seasonally during the November to April diving season.
Cod Hole on the far northern Ribbon Reefs is legendary for its resident population of massive potato cod that approach divers with total confidence, sometimes reaching over a metre in length. The site is accessed mainly via liveaboard and sits at a comfortable 18 m maximum on a coral-rich reef plateau. Schools of barracuda, reef sharks, and vibrant soft corals round out one of the Coral Sea's most memorable dives.
Colombia Shallows forms the upper section of the Colombia reef complex at the southern end of Cozumel and offers one of the island's most diverse fish experiences in just 8–20 m. Huge aggregations of yellowtail snapper, French angelfish, and spotted moray eels occupy every crevice in the spur-and-groove formations, and the large sandy channels between the spurs are reliable hunting grounds for southern stingray. It is equally popular for snorkelling and recreational diving.
Crystal Bay off the northeast tip of Nusa Penida is the best place on Earth to encounter the rare mola mola (ocean sunfish) between July and October, when these bizarre disc-shaped giants rise from the depths to be cleaned. The site descends sharply past 40 m and cold upwellings that attract the sunfish can drop visibility and temperature rapidly, demanding careful dive planning. The upper reef at 10–18 m is an outstanding coral garden in its own right.
E-6 Pinnacle off Wakaya Island in the Lomaiviti Group is an otherworldly dive site — a cluster of seamounts festooned with pink and orange soft corals, sea whips, and wire corals from 8 m to 40 m depth. Hammerhead schools are regularly encountered in open water beside the pinnacles, along with manta rays, eagle rays, and the occasional whale shark. The remote location and exposed position demand careful weather and current planning.
First Cathedral off Lanai island is a dramatic lava tube and cavern system whose domed main chamber is pierced by shafts of light filtering through holes in the rock ceiling, creating a cathedral-like atmosphere at 16 m. Spinner dolphins rest in the calm water near the entrance, and the surrounding reef hosts monk seals, eagle rays, and the endemic Hawaiian cleaner wrasse. The site was extensively surveyed by Dr. Sylvia Earle and remains one of Hawaii's most celebrated dives.
The Great White Wall in Fiji's Rainbow Passage — a tidal channel between Taveuni and Vanua Levu — is one of the Indo-Pacific's most photographed dives. Below 30 m a sheer wall is entirely coated in white soft coral (Dendronephthya sp.) that blooms open in the strong current, creating an ethereal snowfield effect. The passage is diveable on incoming tide only, and the flow carries hammerhead sharks, grey reef sharks, and vast schools of snapper past the wall.
Jabuka (the Apple) is a remote volcanic island rising from the deep central Adriatic, and its underwater pinnacle drops from the surface to over 100 m in intensely blue water. Dense colonies of yellow and orange gorgonians cover the upper 40 m of the pinnacle and are home to sea horses, blennies, and spawning Atlantic bluefin tuna passing the island in spring. The site requires a liveaboard or long boat transfer from Split and demands solid open-water skills.
The uninhabited islet of Klein Bonaire sits just a kilometre offshore and its protected waters offer some of the Caribbean's most pristine reef diving. No Name is one of the top sites, with a sloping reef from 5 to 25 m packed with healthy stony corals, sea plumes, and brain corals in near-perfect condition. Sea turtles are almost guaranteed, and the lack of strong current makes it ideal for photography and relaxed exploration.
Manta Sandy is a broad sandy plateau near Arborek village in Raja Ampat where oceanic manta rays gather at a cleaning station most mornings. The mantas hover motionless above the sand in just 8–15 m of water, allowing extended, unhurried observation and photography. The surrounding seagrass beds are home to nesting sea turtles and walking epaulette sharks.
Molokini is a partially submerged volcanic crater 4 km off Maui's south coast that forms a natural protected amphitheatre with flat-calm water and visibility regularly exceeding 30 m. The inner crater slopes from 5 to 25 m and is home to white-tip reef sharks, eagle rays, and a remarkable density of Hawaiian reef fish including endemic species found nowhere else on Earth. The outer back wall drops 100 m and is reserved for experienced divers.
Osprey Reef is a remote offshore atoll in the Coral Sea, accessible only by liveaboard, and North Horn is its crown jewel. The sheer wall plunges from the surface to beyond 800 m, draped with sea fans and black coral trees. Regular shark feeds have habituated grey reef, silvertip, and oceanic whitetip sharks, making this one of the premier shark encounters in the Indo-Pacific.
Palancar Reef stretches for more than 5 km along Cozumel's southwestern coast and is widely regarded as one of the finest reef systems in the entire Caribbean, recognised as a UNESCO Biosphere Reserve. Palancar Caves is the most spectacular section, featuring a canyon of huge coral pinnacles and swim-throughs at 10–40 m that shelter black grouper, loggerhead turtles, and queen angelfish. The gentle drift current makes navigation effortless and visibility often exceeds 40 m.
Ras Mohammed National Park sits at the southern tip of the Sinai Peninsula where the Gulf of Suez meets the Gulf of Aqaba, creating nutrient-rich upwellings that support extraordinary biodiversity. Shark Reef and Yolanda Reef are the headline sites, featuring sheer walls, resident schools of barracuda and snapper, and the remains of the Yolanda cargo ship scattered down the slope. Visibility regularly exceeds 30 m, making this a must-dive Red Sea location.
The outermost of the Ribbon Reefs, this site features a dramatic vertical wall on the ocean-facing side descending past 30 m, festooned with sea whips, gorgonians, and nudibranchs. The sheltered inner lagoon side is perfect for beginners with sandy slopes hosting garden eels and blue-spotted rays. Minke whale encounters are possible here between June and August.
The SMS Cöln is a German WWI light cruiser lying in pieces at 36–38 m in Scapa Flow, having been more heavily salvaged than her sister ships but still offering a fascinating dive across scattered machinery, armour plating, and superstructure. The scattered debris field is rich with marine life including wolf fish and large edible crabs.
The SMS Dresden is a German WWI light cruiser resting at 36 m in Scapa Flow, famous for two intact large deck guns still in position and excellent penetration opportunities. The wreck sits upright with good visibility and is covered in colourful plumose anemones, dead man's fingers, and a wealth of fish life.
The SMS König is another magnificent WWI German battleship lying upside-down in Scapa Flow, with its keel at around 15 m and its main deck at 42 m. The scale of this vessel is awe-inspiring, and divers can explore propellers, gun turrets, and hull plates teeming with plumose anemones and wrasse.
Salt Pier's massive wooden and concrete pilings, used to load salt cargo ships, have been transformed over decades into artificial reef structures draped from surface to 9 m with sponges, corals, and enormous aggregations of glassy sweeper fish. Frog fish, seahorses, and rare scorpion fish hide among the encrustations, and the whole structure glows at night with bio-fluorescent organisms. Diving is restricted when ships are loading, requiring advance co-ordination.
Santa Rosa Wall is Cozumel's most thrilling drift dive — an almost vertical wall beginning at 7 m that plunges past 40 m with massive purple sea fans and tube sponges projecting into the blue. The incessant current keeps the water crystal clear and nutrient-rich, and the resident hawksbill turtles are so used to divers that they simply carry on grazing the sponge-covered wall. Eagle rays and black tip sharks appear regularly in the open water off the wall.
Sardine Reef off Gam Island is famous for its enormous shoals of silversides that form a living silvery tornado around the coral bommies at 8–20 m. Trevally, giant barracuda, and black-tip reef sharks can often be seen hunting through the bait balls in an electrifying display of open-water predation. The shallow top of the reef at 8 m makes it accessible to most divers.
Two-Mile Reef at Sodwana Bay is the most dived site on South Africa's iSimangaliso Wetland Park coastline, offering spectacular hard and soft coral gardens just two kilometres offshore. Loggerhead and leatherback turtles are resident year-round, and the warm Mozambique Channel current (24–28 °C) sustains an extraordinary diversity of reef fish rivalling any Indo-Pacific destination. Coelacanths have been photographed in the deep submarine canyons directly behind the reef, making this one of the most biodiverse nearshore dives in Africa.
Big Brother and Little Brother are two remote limestone pillars rising from the deep Red Sea, accessible only by liveaboard. Their sheer walls are plastered with pink and orange soft corals and attract oceanic species rarely seen in shallower sites, including thresher sharks, hammerheads, and silky sharks. The north plateau of Big Brother also hosts two impressive wreck dives — the Numidia and the Aida.
Tubbataha Reef is a UNESCO World Heritage Site in the middle of the Sulu Sea, reachable only by liveaboard from Puerto Princesa, Palawan. The north atoll wall drops precipitously from the surface to over 100 m and is patrolled by hammerhead sharks, grey reef sharks, and Napoleon wrasse in extraordinary numbers. Conditions demand experience — current, depth, and open-ocean exposure combine on many of the park's best sites.