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A hawksbill sea turtle (Eretmochelys imbricata), in a colorful overhang on a reef in the Koro Sea, Fiji, South Pacific, Pacific

Green sea turtles (Chelonia mydas), an endangered species, Hawaii, United States of America, Pacific, North America

Gorgonian coral in the background with Arnaz's damselfish (Chrysiptera arnazae), Philippines, Southeast Asia, Asia

Macro shot of stem and branches of orange soft broccoli coral (Dendronephthya hemprichi), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above Table coral, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

School of blue striped snapper (Lutjanus kasmira) underneath table coral, Naama Bay, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Raccoon butterflyfish (Chaetodon lunula) and saddle wrasse (Thalassoma duperrey), off the island of Lanai, Hawaii, United States of America, Pacific, North America

Aerial photography of coral reef formations of the Great Barrier Reef, UNESCO World Heritage Site, near Cairns, North Queensland, Australia, Pacific

Colorful soft corals (Dendronephthya sp.) adorn the stunning reefs of southern Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

A white-v hydroid crab (Hyastenus borradailei), feeding on a colony of green tube coral, Fiji, South Pacific, Pacific

Green sea turtle getting its shell cleaned by goldring surgeonfish off Maui, Hawaii, United States of America, Pacific, North America

Longnose hawkfish (Oxycirrhites typus) on gorgonian sea fans (Subergorgia mollis) a hard coral species found in high current areas, Matangi Island, Vanua Levu, Fiji, Pacific

Several green sea turtles (Chelonia mydas) gather at a cleaning station off West Maui, Hawaii, United States of America, Pacific, North America

Tropical coral reef scene, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Giant sea fan coral (Gorgonian fan coral) (Annella mollis), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Macro shot of stem and branches of pink soft broccoli coral (Dendronephthya hemprichi), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

A hard coral reef along with schooling anthias and reef fish, Crystal Bay, Bali island, Indonesia, Southeast Asia, Asia

Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Magnificent anemone (Heteractis magnifica), Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Shorthead fangblenny (Petroscirtes breviceps), inside a coral encrusted bottle, Philippines, Southeast Asia, Asia

Coral encrusted biosphere in the marine reserve at Gangga Island, Sulawesi, Indonesia, Southeast Asia, Asia

Cave coral (Tubastrea sp.) (Dendrophyllidae) polyps extended and feeding at night, Queensland, Australia, Pacific

Beautiful soft coral on the island of Vanua Balavu, Northern Lau Group, Republic of Fiji, South Pacific Islands, Pacific

Adult grey reef shark (Carcharhinus amblyrhynchos) in Tumakohua Pass, Fakarava, French Polynesia, South Pacific, Pacific

Coastal promenade walkway on east coast of Isla Mujeres, Caribbean Coast, Cancun, Quintana Roo, Mexico, North America

A black and yellow ornate ghost pipefish (Solenostomus paradoxus) pictured against coral, Russell Islands, Solomon Islands, South Pacific, Pacific

Close-up view of a three color parrotfish (Scarus tricolor), coming in for a bite of hard coral, Fiji, South Pacific, Pacific

Bubble coral shrimp (Vir philippinensis) on bubble coral (Plerogyra sp.), Philippines, Southeast Asia, Asia

Lyretail anthias (Pseudanthias squamipinnis) close-up of male, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Alcyonaria coral with schooling anthias dominate this Fijian reef scene, Fiji, South Pacific, Pacific

Old Settlement Bay and Mount Lidgbird on left and Mount Gower by the lagoon with the world's most southerly coral reef, volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Shoal of Red Sea raccoon butterflyfish (Chaetodon fasciatus), Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Aerial photography of coral reef formations of the Great Barrier Reef, UNESCO World Heritage Site, near Cairns, North Queensland, Australia, Pacific

Shorthead fangblenny (Petroscirtes breviceps), inside a coral encrusted bottle, Philippines, Southeast Asia, Asia

Fin of a shorthead fangblenny (Petroscirtes breviceps), inside a coral encrusted bottle, Philippines, Southeast Asia, Asia

Outrigger boats on the coral reef near Salary, South Western coast of Madagascar, Indian Ocean, Africa

Common bigeye (Priacanthus hamrur), sheltering next to coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Turquoise water and the Beachcomber Le Paradis five star hotel, with Mont Brabant in the background, Mauritius, Indian Ocean, Africa

Blackmouth sea cucumber (Pearsonothuria graeffei) on coral reef, Ras Mohammed National Park, Sharm Eel-Sheikh, Red Sea, Egypt, North Africa, Africa

Coral reef scene, shoal of glassfish (Arapriacanthus ransonneti), Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Endemic kentia palms that are also cultivated for worldwide sale with Mount Lidgbird on the left and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Colony of agnificent anemone (Heteractis magnifica), Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Aerial photography of coral reef formations of the Great Barrier Reef, UNESCO World Heritage Site, near Cairns, North Queensland, Australia, Pacific

Colourful reef fishes on the reef at Tumakohua Pass, Fakarava Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Underwater image of the inner lagoon of Apataki coral atoll, Palliser Islands, Tuamotus, French Polynesia, South Pacific, Pacific

Close-up of clown fish and sea anemones, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above coral reef scene, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Longnose hawkfish (Oxycirrhites typus), usually found in the branches of gorgonian sea fans and black coral, Queensland, Australia, Pacific

Pygmy Sweepers surrounding Coral Reef, Parapriacanthus ransonneti, Raja Ampat, West Papua, Indonesia

Purple soft coral, Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Coral growth inside the wreck of the Lesleen M freighter, sunk as an artificial reef in 1985 in Anse Cochon Bay, St. Lucia, West Indies, Caribbean, Central America

White spotted filefish (Cantherhines macrocerus), St. Lucia, West Indies, Caribbean, Central America

Shorthead fangblenny (Petroscirtes breviceps), inside a coral encrusted bottle, Philippines, Southeast Asia, Asia

A view of Grace Bay at the Coral Garden Resort and Somewhere Restaurant, Providenciales, Turks and Caicos, in the Caribbean, West Indies, Central America

Rising to 260 feet above sea level, Makatea is a raised coral atoll with fresh water, Tuamotus, French Polynesia, South Pacific, Pacific

Coral growth inside the wreck of the Lesleen M freighter, sunk as an artificial reef in 1985 in Anse Cochon Bay, St. Lucia, West Indies, Caribbean, Central America