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A tiny hard coral crab can be found burrowing in between the polyps of the coral, Anilao, Philippines.

Underwater clownfish in anemone at Pulau Setaih Island, Natuna Archipelago, Indonesia, Southeast Asia, Asia

Scenic view of the port town of Puerto Ayora, Santa Cruz Island, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Distinctive rocky headland and popular white sand beach of eroded coral in the North West near Dunvegan, Coral Beach, Claigan, Dunvegan, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Half above and half below view of coral reef 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

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

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

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

Pristine shallow waters lap against the white coral sand of a tropical beach; Havodda Island, in the far south of the Maldives, Gaafu Dhaalu atoll, Indian Ocean.

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 drone view of a sandy tropical beach, with a lagoon fringed by a coral reef; Havodda Island, Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

Clownfish (Amphiprion species) guarding their sea anemone home; on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

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, 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.

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

A huge Echinogorgia species sea fan, more than two metres across, 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 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 'plate' corals, growing on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A mix of hard corals, with a Pocillopora species coral in the centre, 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.

Heteractis species sea anemone guarded by Clownfish (Amphiprion species) 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.

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

Schooling scalefin anthias fish (Pseudanthias squamipinnis) and beautiful soft corals of Beqa Lagoon, Fiji.

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

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

The sergeant major or pintano fish(Abudefduf saxatilis) seen 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

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

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

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

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

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

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

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), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, 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

Southern stingray (Hypanus americanus), with snorkeler in shark and ray alley, Caye Caulker, 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) being fed 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

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with sharksucker, Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

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

West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), feeding on the sand 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

Green sea turtle (Chelonia mydas), feeding on the sand 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

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize