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A hawksbill turtle rests on a coral reef, Raja Ampat, Indonesia.
A cove contains thousands of glass fish and some black coral, Raja Ampat, Indonesia.
A whip coral goby broods eggs it has laid on the whip coral where it lives, Anilao, Philippines.
A seahorse clings to a soft coral in a bed of sand, Anilao, Philippines.
A sea spider hunts in coral polyps for its dinner, Anilao, Philippines.
A tiny hard coral crab can be found burrowing in between the polyps of the coral, Anilao, Philippines.
A school of anthias darts around a coral reef, Anilao, Philippines.
A school of yellow snapper hovers close to a coral reef, Maldives.
A school of sweetlip fish stacked up against a coral head, Maldives.
Several pink anemones cluster on top of a coral outcropping providing homes for several anemone fish, Maldives.
A coral bommie full of life, Maldives.
A lionfish poses on a coral reef, Red Sea.
A coral bommie full of reef fish and healthy corals, Red Sea.
A large Napoleon wrasse swimming over a coral reef, Red Sea.
A titan triggerfish hovers in a cleaning station, Red Sea.
Just beneath the surface of the Red Sea lies a beautiful hard coral garden.
A coral bommie in the Red Sea at Yolanda Reef is full of anthias fish.
Denise's pygmy seahorse (Hippocampus denise), Kimbe Bay, Papua New Guinea.
Sea fan on soft coral in Raja Ampat, Indonesia.
Soft coral in Raja Ampat, Indonesia.
Crinoid in Raja Ampat, Indonesia.
Goby on coral, Australia.
Shrimp on bubble coral, Indonesia.
Clownfish in green anemone, Indonesia.
Black Anemonefish, Fiji.
Clownfish in purple tip anemone, Australia.
Extreme close-up showing the detail of Mushroom coral, Indonesia
Orangutan Crab on bubble coral, Indonesia.
Underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia
Snorkeler in underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia
Underwater clownfish in anemone at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia
Scenic view of the port town of Puerto Ayora, Santa Cruz Island, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Distinctive rocky headland and popular white sand beach of eroded coral in the North West near Dunvegan, Coral Beach, Claigan, Dunvegan, Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Half above and half below view of coral reef at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia
Snorkeler in underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Walking close to the water's edge, as pristine shallow waters lap against the white coral sand of a tropical beach, Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives
A bed of Sea Anemones and occasional hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A drone view of a sandy tropical beach, with a lagoon fringed by a coral reef; Havodda Island, Gaafu Dhaalu atoll, Maldives
Clownfish (Amphiprion species) guarding their sea anemone home; on a coral reef in Gaafu Dhaalu atoll, Maldives
A Choriaster species starfish does a 'hand-stand', on a coral reef in Gaafu Dhaalu atoll, Maldives
Goniopora species hard coral, on a coral reef in Gaafu Dhaalu atoll, Maldives
A Crown-of-Thorns starfish (Acanthaster planci) on a badly damaged section of a coral reef in Gaaful Dhaalu atoll, in the faer south of the Maldives.
A shoal of tiny fish swimming over a coral reef in the Gaafu Dhaalu atoll, Maldives
A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A Ctenocella species octocoral sea fan, surrounded by an assortment of hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A huge Echinogorgia species sea fan, more than two metres across, on a coral reef in Gaafu Dhaalu atoll, Maldives
Staghorn scleractinic hard corals (Acropora species), on a coral reef in Gaafu Dhaalu atoll, Maldives
Two-Spot Banded Snappers (Lutjanus biguttatus) on a coral reef in Gaafu Dhaalu atoll, Maldives
A growth of Acropora species, and one Goniastrea species (centre) scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
Mushroon Leather Coral (Sarcophyton species), a soft coral, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, Maldives
A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, Maldives
A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
Acropora species 'plate' corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
A mix of hard corals, with a Pocillopora species coral in the centre, growing on a coral reef in Gaafu Dhaalu atoll, Maldives
A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives
Heteractis species sea anemone guarded by Clownfish (Amphiprion species) on a coral reef in Gaafu Dhaalu atoll, Maldives
A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives
A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives
Pointes des Colibris (Colibris cape), Pointe des Chateaux, Grande-Terre, Guadeloupe
Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Fossil Colonial Coral, Carboniferous Limestone, The Burren, County Clare, Ireland,
A red, white and yellow Christmas tree worm (Spirobranchus giganteus), on coral, Curacao.
Goldentail moray eel (Gymnothorax miliaris), in coral reef, Curacao.
Chain moray eel (Echidna catenata), in coral reef, Curacao.
Christmas tree worms (Spirobranchus giganteus) on brain coral, Saint Croix, U.S. Virgin Islands.
A hawksbill sea turtle (Eretmochelys imbricata) feeds on sponge and an angelfish follows for scraps in Cozumel, Mexico.
A pair of Christmas tree worms in Cozumel, Mexico.
A colorful reef scene with sunburst at Cozumel, Mexico.
World champion free diver and his team in training shot from inside a sunken barge 90 feet below in Bimini, Bahamas.
Diver and boat above black coral bushes in French Cay, Turks and Caicos.
Multiple christmas tree worms, Curacao.
Spiral coral whip on black background.
Pufferfish swimming by star coral, Nassau, The Bahamas.
A diver approaches a beautiful gorgonian sea fan, Cayman Islands.
Hawksbill sea turtle and gray angelfish by coral reef, USS Kittiwake, Grand Cayman.
Hawksbill sea turtle eating, Castle Wall, Grand Cayman.
Colorful reef with fishes and sun burst in Komodo, Indonesia.