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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

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

Scenic view of a lush valley with mountains under a clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

Colorful tunicates and soft corals grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A cluster of colorful tunicates grow on a coral reef amid the remote, tropical islands of Raja Ampat, Indonesia.

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

A broadclub cuttlefish, Sepia latimanus, hovers over a healthy reef on the remote island of Teun in Indonesia's Banda Sea.

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

Glacial iceberg detail from ice calved off the LeConte Glacier, Southeast Alaska, Pacific Ocean, United States of America, North America

Scenic views from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America, North America

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

Lindblad Expeditions guests explore Cape Flora on Northbrook Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

A close up view of a beetle on hogweed (Heracleum spp) found in the Solovetsky Islands, Arkhangelsk Oblast, White Sea, Russia, Arctic, Europe

Views of Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago in Norway, Arctic, Europe

Views of the Monacobreen (Monaco Glacier), in Haakon VII Land on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Views of the Monacobreen (Monaco Glacier), in Haakon VII Land on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

A view of the Mitchell River meandering towards Swift Bay as seen from a commercial helicopter, Kimberley, Western Australia, Australia, Pacific

A view of the Mitchell River meandering towards Swift Bay as seen from a commercial helicopter, Kimberley, Western Australia, Australia, Pacific

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

View over the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Science center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of a boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Playa La Barca, Cabo San Antonio, Guanahacabibes Peninsula National Park and Biosphere Reserve, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

Polar bear (Ursus Maritimus) on Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America

Zodiac in the Arctic desert in Dunes harbour, Devon island, Nunavut, Canadian Arctic, Canada, North America

Dramatic rugged mountain range with a lake, Laguna del Rio Secco and Pico del Pulpito, Sierra Nevada, Andalusia, Spain, Europe

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

Salt flats and distant views of Pichu Pichu, El Misti and Chachani volcanoes, Salinas y Aguada Blanca National Reserve, Arequipa Province, Arequipa Region, Peru, South America

A lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica, Polar Regions

A lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica, Polar Regions

Iceberg detail in and around the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

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

Icebergs and sea ice in the Weddell Sea on the eastern side of the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Iceberg in the Weddell Sea on the eastern side of the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Iceberg in Lemaire Channel on the western side of the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Palm trees on Yacumama Lake, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Nevado Ausangate mountain in the Andes, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America

Valley and Nevado Ausangate mountain in the Andes, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America

Tufts of grass and El Misti and Chachani volcanoes, Salinas y Aguada Blanca National Reserve, Arequipa Region, Peru, South America

Garibaldi refuge in Adamello Park in summer, Vallecamonica, Brescia province, Lombardy district, Italy, Europe

Expansive green landscape at Kol Ukok Lake with majestic mountains in the background under a clear blue sky, Kyrgyzstan, Central Asia, Asia

Traditional yurts in the Song-Kol lake area under a clear blue sky in summer, Kyrgyzstan, Central Asia, Asia

Adult snow petrel (Pagodroma nivea nivea) near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Views of the Errera Channel, between the west coast of Antarctica and Ronge Island, Antarctica, Polar Regions

Iceberg detail in and around the Antarctic Peninsula during the austral summer months, Southern Ocean, Antarctica, Polar Regions

Kicker Rock, a volcanic formation near the island of San Cristobal, a popular spot for snorkelling, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, Arizona, United States of America

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Aerial view, from helicopter, of an ancient oasis in the desert with canyons of the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Black-browed albatross (Thalassarche melanophrys) breeding colony on Steeple Jason Island in the Falkland Islands