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Diver looks on at sponges, coral and crinoids in a colorful Komodo seascape, taken at Cannibal Rock, Horseshoe Bay, Komodo National Park, Indonesia.

Airplane wreck sitting atop reef, overgrown with soft coral and crinoids, Cenderawasih Bay, West Papua, Indonesia.

Soft and hard corals make a coral bommie surrounded by anthias and other small reef fish, Raja Ampat, Indonesia.

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Half above and half below view of coral reef at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

Underwater reef on a remote small Islet in the Badas Island Group off Borneo, Indonesia, Southeast Asia, Asia

Sunrise over Le Morne and coral reef in the turquoise lagoon, aerial view by drone, Baie Du Cap, South Mauritius, Indian Ocean, Africa

Snorkeler with moon jellyfish (Aurelia sp), in Jellyfish Lake, located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

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

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

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

West Indian manatee (Trichechus manatus), on the sand near Caye Caulker, 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), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Dramatic sky over coral reef and inland, aerial view by drone Grand Baie (Pereybere), north-west coast, Mauritius, Indian Ocean, Africa

Anemonefish in anemone on underwater reef on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Above and below view of coral reef and sandy beach on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Hard and soft corals and tridacna clam on underwater reef on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and sea star underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idol (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and giant clam underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of hard and soft coral with a giant clam underwater on Tengah Besar Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idols (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Porcupinefish (Diodon hystrix) on house reef at Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A school of batfish (Platax orbicularis) on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Humbug Dascyllus (Dascyllus aruanus), in stag horn coral head on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and sea star underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Yellowmargin moray eel (Gymnothorax flavimarginatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A pair of spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Porcupinefish (Diodon hystrix) at night on house reef at Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Red crinoid on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Half above and half below view of the Komodo Diving Resort at sunset, Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of baitfish underwater on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of bigeye trevally (Caranx sexfasciatus) on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Aerial panoramic by drone of the coral reef around Long Bay, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

Aerial panoramic by drone of coral reef along Long Bay beach, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

Luxury resort on white coral beach in the clear turquoise water, overhead view, Kendwa, Zanzibar, Tanzania, East Africa, Africa

Turquoise coral reef meeting the waves of the Indian Ocean, aerial view, Poste Lafayette, East coast, Mauritius, Indian Ocean, Africa

Aerial panoramic of waves of Indian Ocean and turquoise coral reef, Poste Lafayette, East coast, Mauritius, Indian Ocean, Africa

A Crown of Thorns starfish (Acanthaster planci), on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A diver around a Stylophora species hard coral, on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives. Indian Ocean, Asia

A gorgonian sea fan (possibly Echinogorgia species) octocoral on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

Small reef fish crowd around outcrops of Pocillopora species hard corals, a coral reef in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

A tropical island fringing reef, just offshore from Havodda island, Gaafu Dhaalu atoll, in The Maldives, Indian Ocean, Asia

Adult reef manta ray (Mobula alfredi), underwater in Coral Bay, Western Australia, Australia, Pacific

A slightly bleached staghorn coral colony grows in shallow water in the Solomon Islands. This Melanesian region is known for its spectacular marine biodiversity.

A Black-finned snake eel (Ophichthus cephalozona) pokes its head out of a sandy seafloor in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Detail of a coral colony in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Detail of a mushroom coral (Fungia sp.) on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Detail of a feather duster worm growing on a coral reef near Alor in the Lesser Sunda Islands of Indonesia.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Fast-growing staghorn coral fragments, Acropora sp., are being grown in hopes of replanting colonies in reef areas of the Caribbean Sea that have been damaged.

A vibrant soft coral, Dendronephthya sp., grows amid the remote, tropical islands of Raja Ampat, Indonesia.

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.