Richelieu Rock
Similan Islands & Khao Lak, Thailand
Schools of chevron barracuda overhead while tigertail seahorses, harlequin shrimps and ghost pipefish hide in fields of soft coral.
- Advanced
- Wall
- Whale sharks
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245 dive sites
Similan Islands & Khao Lak, Thailand
Schools of chevron barracuda overhead while tigertail seahorses, harlequin shrimps and ghost pipefish hide in fields of soft coral.

Sipadan & Semporna, Malaysia
On Sipadan's north coast, divers can end up in the middle of a swirling vortex of chevron or blacktail barracuda.
Dahab, Egypt
Drop through the Bells chimney to a wall at about 25 m, then follow the wall to cross the 7 m saddle into the Blue Hole.
Palau
Hook in above the wall and watch resident grey and whitetip reef sharks, tuna and barracuda work the current.
Galápagos, Ecuador
Wall drift beside the pillars of the arch that collapsed in May 2021, with large numbers of hammerheads, silky and Galápagos sharks.

Marsa Alam & the Brothers, Egypt
Open-ocean reef 25 km north of Marsa Alam where oceanic whitetips frequent the southern plateau, best October to December.

Oahu, United States
Shore dive off Haleiwa Beach Park into a reef-cut trench with ledged walls and small caves, bottoming near 30 m.
Malta, Gozo & Comino, Malta
Beneath the Dingli Cliffs, a wall dive with caves, caverns, overhangs and an archway, dropping beyond 60 m.
Cozumel, Mexico
Sloping reef and wall with gentle currents, much of the dive at 12–25 m, a good introduction to drift diving.
Moalboal, Philippines
A sardine ball that spreads from 2 to about 15 m off Panagsama Beach, hunted by mackerels and tuna, with a thresher shark if you are lucky.
Moalboal, Philippines
A protected island off Moalboal known for swim-throughs and tunnels that split the reef, with schooling fish, reef sharks and turtles.
Malta, Gozo & Comino, Malta
A boat-only wall dive on Malta's west coast with a cave running from the surface down to about 25 m.
Marsa Alam & the Brothers, Egypt
Sheer coral walls plus two wrecks, the Numidia and Aida, with a chance of thresher sharks on dawn dives in autumn and winter.
Marsa Alam & the Brothers, Egypt
Lighthouse reef 80 km off Marsa Alam, only reached by liveaboard, where schooling hammerheads gather, especially in summer.

Belize
Garden eels on a 6 m sand shelf give way to a wall dropping past 30 m into the abyss, with reef sharks patrolling its edge in gentle currents.
Phuket & Koh Lanta, Thailand
One of Thailand's top sites for whale sharks and manta rays, with a wall at the south end dropping to about 70 m.
Malapascua, Philippines
Sandbar island with drop-offs where turtles patrol the walls and a thresher shark occasionally appears.
Grenada
Opened in May 2006 as the world's first underwater sculpture park, with over sixty-five concrete sculptures off Grenada's west coast.
Socorro (Revillagigedo), Mexico
A split-rock pinnacle where whitetip reef sharks pack into crevices while silky and Galapagos sharks cruise the blue.
Palau
A vertical wall dropping to 900 feet, where hawksbill turtles feed and rest on the reef top.
Cozumel, Mexico
A maze of swim-throughs by a 30–50 ft mini wall and Palancar's main wall (14–27 m), with big groupers and hawksbill turtles.
Palau
A 90 m tunnel open at both ends at 35–40 m, with grey reef sharks at the entrance and whitetips resting on the floor.
Azores, Portugal
Côte Vermeille (Banyuls & Collioure), France