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Detail of a reef-building coral colony, Favia sp., growing on a healthy reef in Komodo National Park, Indonesia.

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.

Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Snorkeler in underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

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

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

Nurse sharks (Ginglymostoma cirratum), being fed 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 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

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

Southern stingray (Hypanus americanus) with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Spotted eagle ray (Aetobatus narinari), 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

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

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

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

Aerial view of Balos Lagoon, Balos Beach and Cape Tigani, Gramvousa Peninsula, Chania Region, Crete, Greek Islands, Greece, Europe

Vibrant soft coral colonies grow on a reef dropoff in Lembeh Strait, Indonesia. This area is known for its spectacular marine biodiversity.

Reef-building corals thrive in shallow water in Raja Ampat, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Blue starfish (Linckia laevigata) cling to a coral bommie in Indonesia. This species of seastar is common throughout the Indo-Pacific.

Coral polyps (Galaxea sp.) wait for plankton on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A beautiful starfish (Linckia laevigata) lays on a thriving reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Soft corals, sponges, and other invertebrates compete for space on a beautiful reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

An unusual sea star (Linckia laevigata) clings to a diverse reef near the island of Bangka, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A shallow coral reef thrives in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Christmas tree worms (Spirobranchus giganteus) grow on a coral reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Soft corals grow on the edge of a beautiful reef in the historic Banda Islands of eastern Indonesia.

A beautiful coral reef grows near an island in the Banda Sea, Indonesia. This remote and historic region, known previously for the Spice Islands, harbors extraordinary marine biodiversity.

Soft coral colonies, Sinularia sp., thrive on a reef found among the remote, tropical islands of Raja Ampat, Indonesia.

A cute red-spotted blenny, Blenniella chrysospilos, looks out from its protective home on a coral reef in Indonesia. This combtooth blenny feeds on algae.

A greater blue-ring octopus, Hapalochlaena lunulata, crawls across a coral reef in Komodo National Park, Indonesia. There are several blue-ring octopus species and all of them are extremely venomous.

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.

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

Aerial of a traditional Dhow on a white sand beach, Goa island near the Island of Mozambique, Mozambique, Africa

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Snorkeler with golden jellyfish (Mastigias papua etpisoni), in Jellyfish Lake, a marine lake located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

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

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

Nurse sharks (Ginglymostoma cirratum), being fed 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

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

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

An adult bluestreak goby (Valenciennea strigata), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

A colony of green barrel sea squirts (Didemnum molle), out over the reef off Bangka Island, Indonesia, Southeast Asia, Asia

A broadclub cuttlefish (Sepia latimanus) lays eggs in a coral colony in Komodo National Park, Indonesia.

Driftwood on white sand beach at beautiful Mahoro Island with Masare and Pahepa Islands beyond, Mahoro, Siau, Sangihe Archipelago, North Sulawesi, Indonesia, Southeast Asia, Asia

Anemonefish in anemone 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

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

An adult red cherry shrimp (Neocaridina davidi), out over the reef off Wohof Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Fragile, foliose corals grow on a beautiful reef slope in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

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

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

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