Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Coral reef and sea life banner, The Maldives, Indian Ocean

Underwater marine life on coral reefs, Thailand

Soft corals and sponges underwater on Long Caye in the Mesoamerican Barrier Reef, Belize

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The spectacular scenery on the island of Madeira, Atlantic Ocean, Portugal

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

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

Scenic view of Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

View of the potato patch on Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

Patterns in the kelp at low tide on South Georgia Island, Southern Ocean

Corals and tropical fish, underwater sea life, The Maldives, Indian Ocean

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

Underwater view of of the reef system at Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

Galapagos brown pelican (Pelecanus occidentalis urinator) feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Walrus (Odobenus rosmarus), Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America

Adult green sea turtle (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Thrift (Armeria maritima), Rock sea lavender (Limonium binervosum) and Coastal ragwort (Senecio leucanthemifolius) flowering on karst limestone sea cliffs at Pria, near Ribadesella, Asturias, Spain.

The endemic giant barrel cactus (Ferocactus diguetii) on Isla Santa Catalina in the lower Gulf of California (Sea of Cortez), Baja California, Mexico

Whalebone Alley, female tourist standing between bow head whale rib bones, Itygran Island (Bering Sea) Russia, Asia. MORE INFO: Whale Bone Alley was discovered by Soviet archaeologists in 1976, but has remained untouched since and little is known of this place. There is a long double line of bowhead whale bones -- jaws and ribs -- running parallel along the shore for hundreds of yards. Many of the bones, especially the enormous jaw bones, are still standing, propped up by lichen-covered rocks. The location is thought to have been used in about 1300 as a ceremonial site, for a men's secret society or feasting site.

Inuit Burial ground, grave site, Bering Island (Bering Sea) Russia, Asia

Jourdan's turban (turbo jourdani) large gastropod shell, reddish-brown, Rottnest Island reef, wild, day, marine protected area, free-diving off, cool temperate waters of Western Australia. MORE INFO: Marine plant common kelp, a dominant feature of the underwater landscape. Protected areas are covered in lush growth of diverse algae, also red algea are here.

Silver drummer (kyphosus sydneyanus) silvery grey colour, feeding on brown seaweed, wild, day, schools, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name common buffalo bream, dark tail and a distinctive dark line that looks a little like a moustache below the eye, occur in large schools. Distribution more widespread throughout Australia.

Silver drummer (kyphosus sydneyanus) silvery grey colour, feeding on brown seaweed, wild, day, schools, marine protected area, diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name common buffalo bream, dark tail and a distinctive dark line that looks a little like a moustache below the eye, occur in large schools. Distribution more widespread throughout Australia.

Galapagos white-cheeked pintail (Anas bahamensis galapagensis) feeding near giant tortoise in the Galapagos Island Archipelago, Ecuador

Wild Adult Male and Female, Steller sea lions (Eumetopias jubatus), endangered, colony, rookery, haul out, raft, above water. Bering Islands (Bering Sea) Russia, Asia. MORE INFO: This sea lion in the largest member of the eared seals.

An adult Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

Wild Adult Male and Female, Steller sea lions (Eumetopias jubatus), endangered, colony, rookery, haul out, raft, above water. Bering Islands (Bering Sea) Russia, Asia. MORE INFO: This sea lion in the largest member of the eared seals.

Antarctic Fur Seal, Arctocephalus gazella, roaring, South Georgia, South Atlantic Ocean.

San Esteban spiny-tailed iguana (Ctenosaura conspicuosa), an endemic iguana found only on Isla San Esteban in the Gulf of California (Sea of Cortez), Mexico

Patterns in the kelp at low tide on South Georgia Island in the Southern Ocean. MORE INFO Kelps are large seaweeds belonging to the brown algae (Phaeophyceae) in the order Laminariales.

Antarctic Fur Seal pup, Arctocephalus gazella, portrait, South Georgia, South Atlantic Ocean.

Cardon cactus (pachycereus pringlei) being "painted" with light at night on Isla Catalina in the lower Gulf of California (Sea of Cortez), Baja California, Mexico

Antarctic Fur Seal pup, Arctocephalus gazella, portrait, South Georgia, South Atlantic Ocean.

A juvenile Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

Wild Large Male Northern fur seals ( Callorhinus ursinus ) endangered, colony, rookery, haul out, raft, above water. Bering Islands (Bering Sea) Russia, Asia.

Stromy Arctic weather brings up sea weed on Chirpoy Island (Bering Sea), Russia, Asia

An adult Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

A juvenile Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

An adult Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

An adult Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

Patterns in the kelp at low tide on New Island in the Falkland Islands, South Atlantic Ocean. MORE INFO Kelps are large seaweeds belonging to the brown algae (Phaeophyceae) in the order Laminariales.

Mountain views and iced lake reflections, high ground, Bogoslov Island (Bering Sea) Russia, Asia

Scenic views of open tundra in the Svalbard Archipelago of Norway.

Cardon cactus (pachycereus pringlei) being "painted" with light at night on Isla Catalina in the lower Gulf of California (Sea of Cortez), Baja California, Mexico

An adult Black-crowned Night Heron (Nycticorax nycticorax falklandicus) foraging at low tide on Carcass Island in the Falkland Islands, South Atlantic Ocean

Sunlight streaming through a forest of giant kelp (Macrocystis pyrifera), off Santa Barbara Island, California, United States of America