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Man hiking along the Red Reef Trail, Red Cliffs National Conservation Area, Utah, United States of America, North America

Overhead view of tourist boat on coral reef in the exotic lagoon, Paje, Jambiani, Zanzibar, Tanzania, East Africa, Africa

White sand beach at Turquoise Bay, Ningaloo Reef, UNESCO World Heritage Site, Exmouth, Western Australia, Australia, Pacific

View over Yardie Creek, Ningaloo Reef, UNESCO World Heritage Site, Exmouth, Western Australia, Australia, Pacific

White sand beach at Turquoise Bay, Ningaloo Reef, UNESCO World Heritage Site, Exmouth, Western Australia, Australia, Pacific

Man preparing to dive at Chankanaab Park, famous for its superb coral reef, on the island of Cozumel, off the Yucatan Peninsula, Mexico, North America

Surfer on a large wave with Graciosa Island beyond, at the world class surf reef break known as San Juan, east of Famara in the north of the island, Famara, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Diver enjoying the tube sponges on a wall dive in the Turks and Caicos, West Indies, Caribbean, Central America

Diver enjoys watching a grouper hiding in the coral heads in Turks and Caicos, West Indies, Caribbean, Central America

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Tourists on a semi submersible, viewing the Great Barrier Reef off Cairns in Queensland, Australia, Pacific

Goliath grouper (Epinephelus itajara) next to video camera, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba diver handles nurse shark (Ginglymostoma cirratum) while being filmed, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Tourists snorkelling from a dive and snorkel platform anchored to the Great Barrier Reef off Cairns in Queensland, Australia, Pacific

Goliath grouper (Epinephelus itajara) and shark diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and Nurse sharks approach a diver from behind, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) observed by diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and diver, Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba diver handles nurse sharks (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Diver splits legs apart for passing goliath grouper (Epinephelus itajara), Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba diver handles nurse shark (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Scuba diver handles nurse sharks (Ginglymostoma cirratum), Molasses Reef, Key Largo, Florida, United States of America, North America

Goliath grouper (Epinephelus itajara) and divers, Molasses Reef, Key Largo, Florida, United States of America, North America

Crab preying on dead portuguese man-of-war, Physalia physalis, Praia do Forte, Bahia, Brazil (South Atlantic)

A couple walking along the beach, Sandy Point on Brampton Island, Whitsunday Islands, Great Barrier Reef, Australia

Luxury tent on stilts right at the beach under Pandanus trees, Wilson Island Resort, Wilson Island, part of the Capricornia Cays National Park, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Man walking along the board walk at Missionary Bay, Hinchinbrook Island, Great Barrier Reef, Australia

Tourist with snorkelling gear on Middle Island beach, Island next to Great Keppel Island, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Geoff Mercer, owns a hotel and lives on Great Keppel Island, with tourist on the way to the beach, Great Keppel Island, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Tourist with snorkelling gear on Middle Island beach, Island next to Great Keppel Island, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Guest in the hammock right at the beach under Pandanus trees, Wilson Island Resort, Wilson Island, part of the Capricornia Cays National Park, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Jeep at Fisherman's beach, western Great Keppel Island, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Honeymoon couple at the beach, Wilson Island, part of the Capricornia Cays National Park, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Tourist holding a koala at Bungalow Bay Koala Village, Horseshoe Bay, northcoast of Magnetic island, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Tourist, young man likes Hodoo, eroded Hoodoos, rock formation of Entrada sandstone, Goblin Valley State Park, San Rafael Reef, Utah, southwest, USA, North America

Tourist, young man next to eroded Hoodoos, rock formation of Entrada sandstone, Goblin Valley State Park, San Rafael Reef, Utah, Southwest, USA, North America

Tourist, young man likes Hodoo, eroded Hoodoos, rock formation of Entrada sandstone, Goblin Valley State Park, San Rafael Reef, Utah, southwest, USA, North America

Mark Anders surfing, paddeling in the aqua blue warm water off the coast of Nagigia, Fiji. Nagigia is one of Fiji's many islands famous for its reef surfing.

Scuba diver swims through lava arches with sun rays, Cathedrals dive site, Lanai City, Lanai, Hawaii, United States of America

Young snorkeler dives toward coral in the Buccoo Reef and Nylon Pool, Tobago, Tobago, Republic of Trinidad and Tobago

Two men free diving over a Hawaiian hard coral reef with slate pencil sea urchins (Heterocentrotus mammillatus), Hawaii, United States of America

Hawaii, Oahu, Makapu'u Beach, Group of Tahitian Male and Female Dancers posing, Rabbit Island in background.

Hawaii, Oahu, Makapu'u Beach, Group of Tahitian Male and Female Dancers posing, Rabbit Island in background.

A photographer lines up with his smart phone in a housing on this Green sea turtle (Chelonia mydas) off the coast of Maui, Hawaii, United States of America

Scuba diver looking at bright Butterflyfish (Chaetodontidae), Lanai City, Lanai, Hawaii, United States of America

Diver at one of the many openings around the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

Aerial view of people on stand up paddle boards over the reef on Piti Bay, Mariana Islands, Asan, Guam, Micronesia

A photographer lines up with a SLR in a housing with a macro lens to shoot at tiny crab perched on soft coral, Indonesia

A photographer under a massive school of millions of sardines, Moalboal, Cebu, Central Visayas, Philippines

Divers exploring the prop and rudder at the stern of The Carthaginian, a Lahaina landmark, that was sunk as an artificial reef off Lahaina, Maui, Hawaii in December 2005, Maui, Hawaii, United States of America

Research divers from the MOC Marine Institute glue broken coral heads back together and map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

Research divers from the MOC Marine Institute map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

A research diver from the MOC Marine Institute glues broken coral back together at Molokini Marine Preserve off the island of Maui, Hawaii. The coral is tagged and will be monitored, Maui, Hawaii, United States of America

Diver outside of the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

A photographer lines up with his smart phone in a housing on this Green sea turtle (Chelonia mydas) off the coast of Maui, Hawaii, United States of America

Scuba diver with a large school of Bluestripe Snappers (Lutjanus kasmira) swimming over healthy reef, Lanai City, Lanai, Hawaii, United States of America

Hawaii, An endangered species, green sea turtles (Chelonia mydas) are a common sight in these waters.