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

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 diverse array of corals grow in Raja Ampat, Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Detail of a large coral polyp in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Abstract of a mushroom coral (Fungia sp.) growing on a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Detail of a stony coral (Galaxea sp.) growing in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Fast-growing corals (Acropora sp.) are being grown by scientists in the Caribbean Sea. Once they reach a certain size they will be planted on a reef that has been previously damaged.

Detail of the texture on a mushroom coral (Fungia sp.) growing in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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

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.

Healthy corals thrive along the edge of a mangrove forest in a remote part 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.

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

A bed of Sea Anemones and occasional hard corals, on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A Ctenocella species octocoral sea fan, surrounded by an assortment of hard corals, on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

Staghorn scleractinic hard corals (Acropora species), on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A growth of Acropora species, and one Goniastrea species (centre) scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mixture of scleractinic hard corals on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A school of orange basslets (Pseudanthias squamipinnis) on a healthy Fijian reef full of hard and soft corals, Fiji.

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

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

Detail of anchor coral tentacles (Euphyllia sp.) growing on a reef in Indonesia. This area is known for its high marine biodiversity.

Fragile corals grow in extremely shallow water in Komodo National Park, Indonesia. This part of the Coral Triangle is known for its high marine biodiversity and is a popular destination for scuba divers and snorkelers.

Detail of a mushroom coral (Fungia sp.) on a reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Sunlight sparkles through a table coral (Acropora sp.) in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

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.

Detail of a mushroom coral, Fungia sp., growing on a beautiful reef in Wakatobi National Park, Indonesia.

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 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.

A school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.

Underwater profusion of hard plate corals at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

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

A profusion of hard and soft coral underwater on Siaba Kecil, Komodo Island National Park, Indonesia, Southeast Asia, Asia

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.

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 myriad of hard and soft corals compete for space on the substrate of Darwin's Wall, Palau, Micronesia, Pacific

A shoal of Yellowback Fusiliers (Caesio teres) swim around Acropora species hard corals, Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

Delicate corals grow on a shallow reef near the island of Flores in Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Corals grow on a shallow reef in Indonesia. This beautiful, tropical region is known for its spectacular reefs and high marine biodiversity.

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

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.

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

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

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

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

A profusion of hard and soft coral underwater on Siaba Kecil, Komodo Island National Park, 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

Reef fishes amongst profusion of hard plate at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

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

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

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

Diver with Anthias fish swimming around hard coral, Laguna Reef, Straits of Tiran, Red Sea, Egypt, North Africa, Africa

Diver with Anthias fish swimming around hard coral, Gordon Reef, Straits of Tiran, Red Sea, Egypt, North Africa, Africa

Diver and hard and soft coral reef and lyre tail anthias (Pseudanthias squamipinnis), Marsa Alam, Egypt, Red Sea, North Africa, Africa

Diver and hard and soft coral reef and lyre tail anthias (Pseudanthias squamipinnis), Marsa Alam, Egypt, Red Sea, North Africa, Africa

A multitude of sponges, tunicates, feather stars, sea stars, soft and hard corals as well as fish co-exist harmoniously in the reefs at Cogon, Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia

Split image of hard coral formations near the coast and the Koolau mountains in the background, Kaneohe Bay, Oahu, Hawaii, United States of America, Pacific

Split image of hard coral formations near the coast and the Koolau mountains in the background, Kaneohe Bay, Oahu, Hawaii, United States of America, Pacific

Hard coral and Koolau mountains, Hawaii Institute of Marine Biology, Coconut Island, Oahu, Hawaii, United States of America, Pacific