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Hard and soft coral landscape scenic at Thetford Reef on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Scuba diver swimming with Gopro in coral landscape scenic at Thetford Reef on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

An aerial view of the Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Pacific

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

Striped sweetlips (diagonal banded sweetlips) (Plectorhinchus lineatus), North Ribbon Reef, Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Pacific

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

The lagoon with the world's most southerly coral reef, at this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

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

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

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

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

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

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

A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.

Scenic view of the port town of Puerto Ayora, Santa Cruz Island, Galapagos Island Archipelago, 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

A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.

A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtle (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

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with sharksucker, Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Brassy chubs (Kyphosus vaigiensis), being fed by boat operators inside the Mesoamerican Barrier Reef, Belize

Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Mangrove snappers (Lutjanus griseus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Beach at Coral Bay, Ningaloo Reef, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Ningaloo Reef, Coral Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Looking north to Lover's Bay with two Norfolk Island pines by the lagoon with the world's most southerly coral reef, on this 10km long ancient volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

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 Ocean.

View south from Kim's Lookout to 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

Many mullet and trevally during fish feeding at Ned's Beach, one of the most popular tourist activities on this 10km long volcanic island with the world's most southerly coral reef in the Tasman Sea, Lord Howe Island, New South Wales, Australia, Pacific

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

Guide standing on a hanging bridge above the Coral formations, Tsingy de Bemaraha, UNESCO World Heritage Site, Madagascar, Africa

Coral reef of soft leather corals (Sarcophyton sp.) and limestone islands. Misool, Raja Ampat, Papua, Indonesia, Pacific Ocean. More info: This region has the highest marine biological diversity in the world.

Soft Coral & diver. Sipadan has some of the best dropoffs in the world. Subsequently, here grows some of the prettiest corals (hard & soft) in the Pacific. Sipadan, Malaysia

Cliffs and massive colony of great star coral (Montastrea cavernosa), in shallow tide pool, Fernando de Noronha, UNESCO World Heritage Site, Brazil, South America

Cliffs and massive colony of great star coral (Montastrea cavernosa), in shallow tide pool, Porco's Bay, Fernando de Noronha, UNESCO World Heritage Site, Brazil, South America

Massive colony of great star coral (Montastrea cavernosa), in shallow tide pool, Porco's Bay, Fernando de Noronha, UNESCO World Heritage Site, Brazil, South America

Coral and tide pool with Dois Irmaos in the background, Fernando de Noronha national marine sanctuary, UNESCO World Heritage Site, Pernambuco, Brazil, South America

Coral and tide pool with Dois Irmaos in the background, Fernando de Noronha national marine sanctuary, UNESCO World Heritage Site, Pernambuco, Brazil, South America

Dog and massive colony of great star coral (Montastrea cavernosa), in shallow tide pool, Fernando de Noronha, UNESCO World Heritage Site, Brazil, South America

Massive colony of great star coral (Montastrea cavernosa), in shallow tide pool,Porco's Bay, Fernando de Noronha, UNESCO World Heritage Site, Brazil, South America

Starry night octopus, Octopus luteus, foraging on coral reef at night, Malapascua, Cebu, Philippines, Visayan Sea.

Heron Island with platform reef from above, cords of the coral spawning, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Heron Island and coral from above, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Coral around Heron Island from above, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Reefwalk with Marine Center guide, seestar and coral, near Heron Island, eastern part is part of the Capricornia Cays National Park, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Heron Island with platform reef from above, cords of the coral spawning, Great Barrier Reef Marine Park, UNESCO World Heritage Site, Queensland, Australia

Pygmy seahorse (Bargibanti hippocampus) on a branch of coral, Great Barrier Reef, a UNESCO World Heritage Site, Queensland, Cairns, Australia, Pacific Ocean

Texas Coral Snake (Micrurus tener), adult, Fennessey Ranch, Refugio, Corpus Christi, Coastal Bend, Texas Coast, USA

Manta Ray (Manta birostris) with Remora (Echeneis naucrates) swimming above coral reef to cleaning station, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Reef manta ray (Manta alfredi) swimming above a coral reef, Great Barrier Reef, UNESCO World Heritage Site, Queensland, Cairns, Australia, Pacific Ocean

Banded Bubble Starfish or Warty Starfish (Echinaster callosus), Sabang Beach, Puerto Galera, Mindoro, Philippines, South China Sea

Blackspotted Puffer (Arothron nigropunctatus, Arothron citrinellus), yellow variety, swimming in coral reef, Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Spotted Eagle Rays (Aetobatus narinari) with Live Sharksuckers (Echeneis naucrates) swimming above a coral reef with sandbanks and White Mullet (Mugil curema) near the surface, Half Moon Caye, Lighthouse Reef, Turneffe Atoll, Belize, Central America, Cari

Scuba diving group swimming from the diving boat above a sandy seabed to a coral reef, Half Moon Caye, Lighthouse Reef, Turneffe Atoll, Belize, Central America, Caribbean

Spotted Eagle Ray (Aetobatus narinari) from above with dotted markings, Live Sharksuckers (Echeneis naucrates) above a coral reef with sandbanks, Half Moon Caye, Lighthouse Reef, Turneffe Atoll, Belize, Central America, Caribbean

Aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Bearded scorpionfish (Scorpaenopsis barbata) in perfect camouflage on stone coral, Gangga Island, Bangka Islands, North Sulawesi, Indonesia, Molucca Sea, Pacific, Asia

Diver watching Sea Fans (Gorgonaria) on coral reef, colorful overgrown with corals, Gangga Island, Bangka Islands, North Sulawesi, Indonesia, Molucca Sea, Pacific Ocean, Asia

Aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Female diver with a lamp looking at a Barrel Sponge (Xestospongia muta) in a multi-coloured coral reef with various sponges and corals, Hopkins, Dangria, Belize, Central America, Caribbean

Graphic structure and polyps of a Mushroom coral (Fungia sp.), Selayar Island, West coast, South Sulawesi, Indonesia, Java Sea, Indian Ocean

Spotted Eagle Ray (Aetobatus narinari) from the front, frontal, swimming above a coral reef, Hopkins, Dangria, Belize, Central America, Caribbean

Aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Panorama, aerial view of the ocean floor, Heart Reef, heart-shaped reef, Great Barrier Reef World Heritage Area, Great Barrier Reef, UNESCO World Heritage Site, Queensland, South Pacific, Australia

Zoanthid Polyps of a Hexacoral (Protopaythoa sp.), Selayar Island, West coast, South Sulawesi, Indonesia, Java Sea, Indian Ocean