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Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, feeding on soft coral, side view, South Ari Atoll, Maldives.

A Crown of Thorns starfish (Acanthaster planci), 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

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral 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.

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

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

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

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

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across 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 West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sandy seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

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

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

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

Aerial of a white coral beach, Anaa atoll, Tuamotu archipelago, French Polynesia, South Pacific, Pacific

Aerial of a white coral beach, Anaa atoll, Tuamotu archipelago, French Polynesia, South Pacific, Pacific

Eye and siphon detail of reef octopus (Octopus cyanea), crawling over reef, Ailuk atoll, Marshall Islands, Pacific

Plate coral (Pavona minuta) and surgeon fish (Acanthurus spp.), Namu atoll, Marshall Islands, Pacific

Marshallese boy smiling underwater next to coral reef and coconut trees lining the shore of Majikin Island, Namu atoll, Marshall Islands, Micronesia, Pacific

Fan coral (Subergorgia sp.), with black feather stars attached, Namu atoll, Marshall Islands, Pacific

Lobe coral (Porites lobata) covered with christmas tree worms (Spirobranchus giganteus), Namu atoll, Marshall Islands, Pacific

Yellow-edged lyretail grouper (Variola louti) transitional phase, Rongelap, Marshall Islands, Micronesia, Pacific

Red snapper (Lutjanus bohar) swimming over coral reef, Rongelap, Marshall Islands, Micronesia, Pacific

Arc-eye hawkfish (Paracirrhites arcatus) on stiff finger coral (Lobophytum sp.), Namu atoll, Marshall Islands, Pacific

Freckled (blackside) hawkfish (Paracirrhites forsteri) on cat's paw coral (Acropora palifera), Namu atoll, Marshall Islands, Pacific

Small giant clam (Tridacna maxima) surrounded by lobe coral (Porites lutea), Namu atoll, Marshall Islands, Pacific

Over under image of coral reef ( Acropora spp.) and trees at Majikin Island, Namu atoll, Marshall Islands, Pacific

Pair of wire coral gobies (Bryaninops yongei) on wire coral (Cirripathes anguina), Ailuk atoll, Marshall Islands, Pacific

Fan coral (Subergorgia sp.), with black feather stars attached, Namu atoll, Marshall Islands, Pacific

Survey divers on ascent over coral reef, mainly Acropora palifera, Namu atoll, Marshall Islands, Pacific

Small giant clam (Tridacna maxima) surrounded by lobe coral (Porites lutea), Namu atoll, Marshall Islands, Pacific

Pair of orange-finned anemonefish (Amphiprion chrysopterus), and Merten's sea anemone (Stichodactyla mertensii), Namu atoll, Marshall Islands, Pacific

Scientific divers conducting a survey on a highly diverse coral reef, Namu atoll, Marshall Islands, Pacific

Highly diverse coral reef, mainly fire coral (Millepora platyphylla) and cauliflower coral (Pocillopora meandrina), Namu atoll, Marshall Islands, Pacific

Pair of moorish idols (Zanclus cornutus) swimming over coral (Rhodactis howsii), Namu atoll, Marshall Islands, Pacific

Pair of orange-finned anemonefish (Amphiprion chrysopterus), and Merten's sea anemone (Stichodactyla mertensii), Namu atoll, Marshall Islands, Pacific

Wire coral goby (Bryaninops yongei) on wire coral (Cirripathes anguina), Namu atoll, Marshall Islands, Pacific

Pair of endemic three-banded anemonefish (Amphiprion tricinctus) and bulb anemone (Entacmaea quadricolor), Namu atoll, Marshall Islands, Pacific

Humbug dascyllus (Dascyllus aruanus) sheltered in cat's paw coral (Acropora palifera), Namu atoll, Marshall Islands, Pacific

Longnose filefish (Oxymonacanthus longirostris) feeding on coral (Acropora isopora sp.), Ailuk Atoll, Marshall Islands, Micronesia, Pacific

Shallow coral reef on sandy bottom, mainly Acropora spp. and Pocillopora spp., Namu atoll, Marshall Islands, Pacific

A coral atoll from the air, part of the Great Barrier Reef near Cairns, Queensland, Australia, Pacific

Fire coral (Millepora platyphylla) and schooling purple queen anthias (Pseudanthias pascalus), Ailuk atoll, Marshall Islands, Pacific

Christmas tree worms (Spirobranchus giganteus) on lobe coral (Porites lobata), Namu atoll, Marshall Islands, Pacific

Arc-eye hawkfish (Paracirrhites arcatus) on stiff finger coral (Lobophytum sp.), Namu atoll, Marshall Islands, Pacific

Rowing at sunset in Tahiti, French Polynesia, Tahiti Nui, Society Islands, French Polynesia, South Pacific.