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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 shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae) flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive at sunset in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), flukes-up dive in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

Wreck of a C-53 Skytrooper, which went down on February 26, 1942 in Vansittart Bay, Kimberley, Western Australia, Australia, 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

Snorkelers on the surface of a blue hole. Virgin Blue Hole dive site, Palau, Micronesia, Pacific Ocean. More info: Blue holes such as this are submerged limestone sink holes.

Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.

Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Aerial view of Kittiwake shipwreck artificial reef dive site, Grand Cayman, Cayman Islands, Caribbean

Coral block with different stony corals (Scleractinia), Melithaea gorgonian (Melithaea sp.), Feather star, yellow (Crinoidea) and Sabre squirrelfish (Sargocentron spiniferum), three, Great Barrier Reef, Coral Sea, Pacific, Australia, Oceania

Two Reef manta rays (Mobula alfredi) swims with open mouth over sandy bottom, from the front, Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Chocolate Chip Starfish (Protoreaster nodosus) on rocks at low tide, Panglao, Central Visayas, Philippines, Asia

Detail of toxic Crown-of-thorns starfish (Acanthaster planci), spines, crown of thorns, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Pilot Fish (Naucrates ductor) swimming in front of mouth, reef manta ray (Mobula alfredi) with curled up head fins, Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba diver on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Scuba diver watching Giant starfish (Linckia columbia) on rock overgrown with algae, Cabo Marshall, Galapagos archipelago, Unesco World Nature Preserve, Ecuador, South America, Pacific

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Tame Bottlenose Dolphin (Tursiops truncatus) and scuba divers on the ocean floor, tourist attraction, Roatan, Honduras, Caribbean

Red Lionfish (Pterois volitans) hunting Glassy Sweepers (Pempheridae), Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Detail of dorsal fin, parrot fish (Scarus), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Polyps of a mushroom coral (Fungiidae) Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Green turtle (Chelonia mydas) with ship holder (Remora remora), dive site House Reef, Mangrove Bay, El Quesir, Egypt, Red Sea, Africa

Hemprich's tree coral (Dendronephthya hemprichi) and backlit diver, Fury Shoals reef dive site, Red Sea, Egypt, Africa

Ocellaris Clownfish (Amphiprion ocellaris) in Magnificent sea anemone (Heteractis magnifica), Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Tiger Shark (Galeocerdo cuvier) with shoal of fish Surgeonfishes (Acanthuridae), Indian Ocean, Fuvahmulah Island, Gnaviyani Atoll, Maldives, Asia

School of fish Harlequin sweetlips (Plectorhinchus chaetodonoides), Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Reef manta ray (Mobula alfredi), silhouette, swimming in blue water, back light, Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

Diver observes reef manta ray (Mobula alfredi), Great Barrier Reef, Unesco World Heritage, Coral Sea, Pacific, Australia, Oceania

Mating of two pairs Spinner Dolphins (Stenella longirostris), Red Sea, Sataya Reef, Marsa Alam, Egypt, Africa

Three group of Spinner Dolphins (Stenella longirostris) swims over sandy bottom, Red Sea, Sataya Reef, Marsa Alam, Egypt, Africa

Sea Cow (Dugong dugon) with scubadivers swim under surface of blue water, Red Sea, Hermes Bay, Marsa Alam, Egypt, Africa

Tail of a floating Sea Cow (Dugong dugon) with Golden Trevallys (Gnathanodon speciosus), rear view, Red Sea, Hermes Bay, Marsa Alam, Egypt, Africa

Green Sea Turtle (Chelonia mydas) swim over sandy bottom in the blue water, Red Sea, Marsa Alam, Egypt, Africa

Diver looks at reef formation known as sarcophagus in archway from south plateau of Elphinstone Reef, Red Sea, Egypt, Africa

Aerial view, panorama, lagoon of the Maldives Islands Olhuveli and Bodufinolhu respectively Fun Island Resort, South-Male-Atoll, Maldives, Asia

Sunset, Hammock on stilts over the sea, Indian Ocean, symbol for relaxation, recreation, vacation, Summer Island, North Male Atoll, Maldives, Asia

Bluespotted ribbontail ray (Taeniura lymma) swimming over sandy bottom Red Sea, Aqaba, Kingdom of Jordan

Open coral polyps on the trunk of a soft coral (Dendronephthya), coral, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Underside with mouth of spiny cushion star (Culcita novaeguineae), Detail, Starfish, Pacific, Great Barrier Reef, Australia, Oceania

Pectoral fin, Red Lionfish (Pterois volitans) detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Sandy beach beach with bar at the coral reef Abu-Dabbab at sunset, Hilton Nubian Resort, Al Qusair, Marsa Alam, Egypt, Africa

Slice anemone, Giant Cup Mushroom (Amplexidiscus fenestrafer), detail with mouth, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Colony of coral polyps in brain corallae (Physogyra lichtensteini), Pacific, Great Barrier Reef, UNESCO World Heritage Site, Australia, Oceania

Detail of Eye patch sea cucumber (Bohadschia argus), Pacific, Great Barrier Reef, Australia, Oceania

Open coral polyps on Mopsella sea fan (Mopsella) Pacific, Great Barrier Reef, UNESCO World Natural Heritage, Australia, Oceania

Limestone skeleton of the Klunzinger soft coral (Dendronephthya klunzingeri), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Egyptian camels Dromedaries (Camelus dromedarius) on the beach and coral reef Abu-Dabbab, Hilton Nubian Resort, Al Qusair, Marsa Alam, Egypt, Africa

Syphon of giant clam (Tridacna gigas), Clam meat, detail, pacifica, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Soft coral, leather coral (Lobophytum) with semi-enclosed polyps, detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Graphic structure on underside of Red Pillow Starfish (Halithyle regularis), detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Detail of Forsskal's Pleurobranch (Pleurobranchus forskalii), Backshielded Snail, Nudibranch, Detail, Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Detail of tail fin, parrot fish (Scarus), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Island holiday paradise sea text free space copyspace Halaveli Resort Ari Atoll aerial photo tourism in the Maldives

Crowned Puffer (Canthigaster coronata) swimming over seagrass meadow, Red Sea, Aqaba, Kingdom of Jordan

Red Sea Grey Humbug (Dascyllus marginatus) seeks shelter in in Stylophora stony coral (Stylophora subseriata) on seagrass meadow, Red Sea, Aqaba, Kingdom of Jordan

Shoal of Common Bigeye (Priacanthus hamrur) Bass swimming backlit over coral reef, Red Sea, Aqaba, Kingdom of Jordan

Shoal of Sardinops (Sardinops sagax) sardines, Indian Ocean, Pescador Island, Moalboal, Cebu, Philippines, Asia