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Walkers in montane grassland environment,showing erosion by humans of footpath, Horton Plains National Park, Sri Lanka, Asia

Remnants of the abandoned Norwegian whaling station at Ocean Harbour, South Georgia Island, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Young adult bull southern elephant seal (Mirounga leonina) close up while swimming in glacier run off, South Georgia Island, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

British Antarctic Survey (BAS) research plane landing at the Chilean Research base Frei on King George Island, Antarctica, Polar Regions

The Lindblad Expedition ship National Geographic Explorer near a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

Mountain lake, Laguna Larga, at the foot of Mulhacen, Spain's highest mountain in the Sierra Nevada, Andalusia, Spain, Europe

A dawn Zodiac tour of Boatswain Bird Island just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Tourist vehicle on Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

King penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

Views of the glaciers and mountains of Drygalski Fjord on the southeast side of South Georgia, Southern Ocean, Polar Regions

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia, Southern Ocean, Polar Regions

Ice held up to the sun near the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

A view of icebergs in the Lemaire Channel on the west side of the Antarctic peninsula in Antarctica, Polar Regions

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Views of the Chilean Antarctic refuge hut Jorge Bonnen Rivera situated on Hut Point on the Antarctic Peninsula, Antarctica, Polar Regions

Juvenile mantled howler monkey (Alouatta palliata) in Pacific coast forest, known for their loud call, Esperanza, Nosara, Guanacaste, Costa Rica

Four-wheel drive vehicle in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Isolated tree among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

A view of Isfjorden (Ice fjord) on the western side of Spitsbergen Island in the Svalbard Archipelago, Norway

Adult humpback whale (Megaptera novaeangliae), surfacing near researchers in Zodiac at sunset, Iceland

Sea lions (Otaria flavescens) in the Beagle Channel, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

Macaroni penguins (Eudyptes chrysolophus) scrambling up steep cliffs at Hercules Bay on South Georgia Island, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

A commercial whale watching boat being launched at the beach at low tide in Puerto Pyramides, Golfo Nuevo, Argentina, South America

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Guests from the Lindblad Expedition ship National Geographic Explorer at Hornsund (Horn Sound) in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

CT Ticknor, staff member from the Lindblad Expedition ship National Geographic Explorer using binoculars in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guest from the Lindblad Expeditions ship National Geographic Sea Bird behind a mushroom or toadstool in Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

The Lindblad Expedition ship National Geographic Explorer pushing through ice in the Svalbard Archipelago, Norway, Arctic, Europe

Ice crystals, Science Center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Views of the glaciers and mountains of Drygalski Fjord on the southeast side of South Georgia, Southern Ocean, Polar Regions

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Reflections of icebergs in the calm water photographed from an expedition ship operating in Antarctica, Southern Ocean, Polar Regions

Expedition ship Europa operating from Ushuaia, Argentina to the Antarctic Peninsula in Antarctica, Southern Ocean, Polar Regions

Argentine ship the Puerto Deseado operating from Ushuaia, Argentina to the Antarctic Peninsula in Antarctica, Southern Ocean, Polar Regions

Tourist photographing a wild Galapagos giant tortoise (Geochelone elephantopus) feeding on the upslope grasslands of Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult South Georgia pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

Landing with a zodiac in Ainsworth Bay, Alberto de Agostini National Park, Tierra del Fuego, Patagonia, Chile, South America

Excursion with zodiac around the Pia Glacier, Cordillera Darwin, Northeast branch of the Beagle Channel, Tierra del Fuego, Patagonia, Chile, South America

An adult red-footed booby (Sula sula), in its white color morph plumage in flight over the ocean in Palau, Micronesia, Pacific

Drone aerial view of Lake Polyfyto mountain landscape and high bridge of Servia Neraida at sunset, Kozani, Macedonia, Greece

Close-up of a Horned Yak and mountainous backdrop on the Langtang Valley trek, Himalayas, Nepal, Asia

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

View of tidewater glacier deep inside Neko Harbor on the western side of the Antarctic Peninsula, Southern Ocean, Polar Regions

View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions