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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 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 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.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Walking close to the water's edge, as pristine shallow waters lap against the white coral sand of a tropical beach, Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, Gaafu Dhaalu atoll, Maldives

A drone view of a sandy tropical beach, with a lagoon fringed by a coral reef; Havodda Island, Gaafu Dhaalu atoll, Maldives

A Crown-of-Thorns starfish (Acanthaster planci) on a badly damaged section of a coral reef in Gaaful Dhaalu atoll, in the faer south of the Maldives.

A Ctenocella species octocoral sea fan, surrounded by an assortment of hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A huge Echinogorgia species sea fan, more than two metres across, on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of hard corals, with a Pocillopora species coral in the centre, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Heteractis species sea anemone guarded by Clownfish (Amphiprion species) on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

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

A shoal of Yellowback Fusiliers (Caesio teres) swim around Acropora species hard corals, 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.

Clownfish (Amphiprion species) guarding their sea anemone home; on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

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

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

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

Mushroon Leather Coral (Sarcophyton species), a soft coral, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

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

A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

Staghorn scleractinic hard corals (Acropora species), on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

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

Small giant clam (Tridacna maxima) surrounded by lobe coral (Porites lutea), 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