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

Abandoned Dawada oasis village at Gabraoun, Touareg, Gabroun, Sahara desert, Fezzan, Libya, North Africa, Africa

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Expedition cruise vessel in Hornesund Fjord in summer sunshine, Spitzbergen, Svalbard, Arctic Norway, Scandinavia, Europe

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

Expedition tourists kayaking in snowy weather, with blue icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Jagged mountain peaks, Raftsundet Strait, tour boat in Trollfjorden fiord, Lofoten Islands, northern Norway, Scandinavia, Europe

Camp 1, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Expedition tourists kayaking in cold, snowy weather, with icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Australis expedition cruise ship anchored in front of Navarino island, Tierra del Fuego, Chile, South America

Zodiac boat, expedition tourists, landing beach, Half Moon Island, Livingston Island view, South Shetland Islands, Antarctica, Polar Regions

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

A geological formation known as the Flaming Cliffs where Andrew Shapman expedition discovered the first dinosaurs eggs, Mongolia, Central Asia, Asia

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Climbing expedition leaving base camp on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Leaving camp 4, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Damoy Hut, expedition ship visitor in the snow, Historic Monument, Dorian Bay, Wiencke Island, Antarctic Peninsula, Antarctica, Polar Regions

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mt McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Expedition ship visit, Damoy Hut, former British Air Transit Facility, Historic Monument, Dorian Bay, Wiencke Island, Antarctica, Polar Regions

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

An Everest expeditioner sits among his mountain of equipment while he checks his email with a satelite modem, Khumbu Region, Nepal, Asia

Expedition visit, British Historic Monument Damoy Hut and Bahia Dorian Argentine Refuge, Dorian Bay, Wiencke Island, Antarctica, Polar Regions

Expedition tourists leave Half Moon Island, Livingston Island blue glaciers and evening sun, South Shetland Islands, Antarctica, Polar Regions

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

Perito Moreno Glacier, UNESCO World Heritage Site, around El Calafate, Santa Cruz province, Patagonia, Argentina, South America

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

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

Cerro Torre, one of the hardest peaks in the world to climb, El Chalten Massif, Argentine Patagonia, Argentina, South America

View of calm seas and reflected mountains surrounding Paradise Bay on the western side of the Antarctic Peninsula, Polar Regions

Views of the Chilean inactive research base Gonzalez Videla on Waterboat Point in Paradise Bay, Antarctica, Polar Regions

Aerial of a little ship floating between the ice below the Eqi glacier, Western Greenland, Denmark, Polar Regions

Guests from the Lindblad Expedition ship National Geographic Explorer kayaking in the Svalbard Archipelago, Norway, Arcitc, Europe

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

Guest from the Lindblad Expedition ship National Geographic Explorer photographing soda straw ice 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 a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

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