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Eldborg volcanic crater, declared a Protected Natural Monument in 1974, Iceland, Polar Regions
Mount Vesuvius volcano crater and red rock landscape, near Naples, Campania, Italy, Europe
Aerial panoramic of Vesuvius volcano at sunrise, Naples, Campania, Italy, Europe
Adult male Grant's gazelles (Nanger granti), inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Smoke over the two craters of Erta Ale volcano summit caldera, Danakil Depression, Afar Region, Ethiopia, Africa
Panoramic aerial view of sunset over the active Erta Ale volcano crater, Danakil Depression, Afar Region, Ethiopia, Africa
A view of the boiling mud at Namafjall, Iceland
Gran Cratere (The Great Crater) and Aeolian Islands view, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Smoking Ambrym volcano, Vanuatu, Pacific
Crater of Rano Kau Volcano at sunset, Easter Island, Chile, South America
Bingham Canyon Copper Mine, Salt Lake City, Utah, United States of America, North America
Main open-pit copper-sulphur mine at Rio Tinto, Huelva, Southwest Spain, Europe
Tourist jeeps on safari at sunrise, Ngorongoro Crater Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Sunrise, Ngorongoro Crater Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Cattle egret (Bubulcus ibis) and hippo (Hippopotamus amphibius) at a water hole, Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa
View over the Sete Cidades crater, Island of Sao Miguel, Azores, Portugal, Atlantic, Europe
Lesser flamingos (Phoenicopterus minor) feeding on crater lake, Tanzania, East Africa, Africa
Cape buffalo (Syncerus caffer) grazing in the Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Wizard Island in Crater Lake, the deepest lake in the United States, Crater Lake National Park, Oregon, United States of America, North America
Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Aerial view of Ngorongoro Crater in the Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Exploring a volcanic landscape on a footpath up Saxholl cinder cone and crater, Snaefellsjokull National Park, western Iceland, Polar Regions
Majestic crater of Hondo volcano (Calderon Hondo) with the ocean in background, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Red Crater and Mount Ngauruhoe in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Emerald lake on volcano slope, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Close up of turquoise, vibrant Emerald Lake with steaming volcano, Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Close up of turquoise, vibrant Emerald Lake with steaming volcano on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Turquoise and yellow green Emerald Lake in front of the Tongariro Volcano, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Wide angle view of an Emerald Lake in front of Red Crater Volcano in the Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Emerald Lake in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions
Mount Vesuvius volcano crater and red rock landscape, near Naples, Campania, Italy, Europe
Mount Vesuvius volcano crater and red rock landscape, near Naples, Campania, Italy, Europe
Thomson's gazelles (Eudorcas thomsonii), in Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
People walking on the edge of the crater of Mount Vesuvius, Province of Naples, Campania region, Italy, Europe
People walking through fumaroles on Volcano Gran crater rim, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Aerial view of wine growing district of La Geria, Timanfaya National Park, Lanzarote, Las Palmas, Canary Islands, Spain, Atlantic, Europe
Crater of Rano Kau Volcano at sunset, Easter Island, Chile, South America
Flat top acacia trees (Vachellia abyssinica) along a road leading to the Ngorongoro Crater, Tanzania, East Africa, Africa
People walking on the edge of the crater of Mount Vesuvius, Province of Naples, Campania region, Italy, Europe
Sunrise at the volcano slopes Red Crater, Tongariror Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Aerial of a Volcanic crater outside, Goma, Democratic Republic of Congo, Africa
Lava and ash floes in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America
Mount Vesuvius volcano crater and red rock landscape, near Naples, Campania, Italy, Europe
Cane Malu moonlike crater full with water, Sardinia, Italy, Mediterranean, Europe
Quilotoa Lake, Cotopaxi Province, Ecuador
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Khorgo volcano crater and White Lake in the background, Tariat district, North Hangay province, Mongolia, Central Asia, Asia
Panorama of the western Bonito Lava Field at Sunset Crater Volcano, Arizona, United States of America, North America
Tourists on Volcan Poas, the Active Crater of 2704m set in it's own National Park, Alajuela Province, Costa Rica
Aerial view of the crater of Volcan de la Corona at sunrise, Haria, Las Palmas, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Aerial over Trou du Natron with volcano Tousside in the background, Tibesti Mountains, Chad
Volcanic landscape of the Masaya caldera, Nicaragua's first national park, with craters and a'a blocky lava, Masaya, Nicaragua, Central America
Wizard Island and the still waters of Crater Lake, the deepest lake in the U.S.A., part of the Cascade Range, Oregon, United States of America, North America
Water buffalo around a safari vehicle in the Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Orongo Crater, Rano Kau, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island (Isla de Pascua), Chile, South America
Smoking Ambrym volcano, Vanuatu, Pacific
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
The three emerald lakes and volcano landscape of the Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Orongo Crater, Rano Kau, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island (Isla de Pascua), Chile, South America
Crater of the Poas volcano, San Jose, Costa Rica, Central America
Hverfell Crater rising out of the Dimmuborgir Lava Field, Myvatn Region, Iceland, Polar Regions
View from the Mount Pico, Pico Island, Azores, Portugal, Atlantic, Europe
Inside the crater on the top of Mount Kilimanjaro with the highest point Uhuru Peak at the end of the ridge, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Sunrise above the Emerald Lakes, view from red crater, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Common zebras (Equus quagga) in the Ngorongoro crater, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Panorama of the red sunrise on Red Crater Volcano and view of Mount Tongariro, North Island, New Zealand, Pacific
Excelsior Geyser Crater. Yellowstone National Park, Wyoming, USA, North America
Road across a volcanic crater, with small buildings in the distance, inland on the island of Sao Vicente, Republic of Cape Verde Islands, Atlantic, Africa
Welwitschia, Welwitschia mirabilis, Messum Crater, Namibia, Africa
Aerial view of Vesuvius crater and Sorrento peninsula at sunrise, Naples, Campania, Italy, Europe
Panorama view of O'Leary Peak on the left and Sunset Crater on the right from the Bonito Lava Field near Flagstaff, Arizona, United States of America, North America
Super Pan view of the Cinder Hills on left and the eastside of Sunset Crater on the right, near Flagstaff, Arizona, United States of America, North America
Lesser flamingos (Phoenicopterus minor) feeding on crater lake, Tanzania, East Africa, Africa
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Miradouro do Cerrado das Freiras viewpoint on the huge volcanic crater that is now Lagoa Azul on Sao Miguel island, Azores Islands, Portugal, Atlantic, Europe
View of Sunset Crater Volcano from the east slope of the Lenox Crater Trail, the dark gray soil is volcanic pumice, Arizona, United States of America, North America
Burned out tree on the left with Sunset Crater Volcano in the background, near Flagstaff, Arizona, United States of America, North America