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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 Darwin's Wall, 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

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

Nurse shark (Ginglymostoma cirratum), with boat 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

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

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

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

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

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

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Soft leather corals grow in the shallow waters in the Solomon Islands, Melanesia. This region, in the eastern part of the Coral Triangle, harbors spectacular marine biodiversity and is known for its beautiful reefs.

A hawksbill sea turtle swims over a coral reef in Palau. This is an endangered species often hunted for its shell and meat.

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 beautiful set of tiny tunicates grows on a reef in Indonesia.This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A pycnogonid, or sea spider, crawls along the mucky seafloor of Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Vibrant tunicates, sponges, hydroids, and echinoderms grow on a coral reef among the remote, tropical islands of Raja Ampat, Indonesia.

A crown-of-thorns sea star (Acanthaster planci) feeds on a living coral colony among the remote, tropical islands of Raja Ampat, Indonesia.

A false clownfish, Amphiprion ocellaris, swims among the tentacles of its host anemone in 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.

Several pink anemones cluster on top of a coral outcropping providing homes for several anemone fish, Maldives.

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

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort 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

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 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

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

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

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

Sea Star seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Half above and half below on a remote small Islet in the Badas Island Group off Borneo, Indonesia, Southeast Asia, Asia

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

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

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

Underwater reef system on pink sand beach, Komodo National Park, Komodo Island, Indonesia, Southeast Asia, Asia

A school of bigeye trevally (Caranx sexfasciatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Common lionfish (Pterois volitans) at night near the dock of the Komodo Island Diving Resort, Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals as well as reef fish underwater at Batu Bolong, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Aerial panoramic of white sand beach and coral reef, Long Bay, Antigua and Barbuda,, Leeward Islands, West Indies, Caribbean, Central America

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 flathead fish camouflages itself in the sandy seafloor of Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Detail of an encrusting sponge growing on a reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A colorful crinoid clings to a coral reef slope in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

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

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

A beautiful soft coral colony, Dendronephthya sp., grows amid the remote, tropical islands of Raja Ampat, Indonesia.

Aerial view of beautiful limestone islands scattered about the seascape in Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

Sunlight filters into the shadows of a thick mangrove forest 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 brightly colored soft coral adorns prop roots in a blue water mangrove forest in Raja Ampat, Indonesia.

A colorful soft coral adorns a giant clam, Tridacna sp., growing on a healthy reef in Raja Ampat, Indonesia.

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort 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

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