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Third crater, created in 1994 and containing green lake, Irazu Volcano, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America
Malyi Semyachik volcano, acid lake inside summit crater, Kamchatka, East Siberia, Russia
Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America
The very acid Ijen crater lake in the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia
Backlit image of workers loaded with sulphur pieces cut out from a sulphur mine on Ijen crater lake, Java, Indonesia, Southeast Asia, Asia
Crater Lake and Wizard Island at dawn, Crater Lake National Park, Oregon, United States of America, North America
Aerial of a tuquoise crater lake on top of Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Cerro Catedral and Lago Toncek, Nahuel Huapi National Park, Bariloche, Patagonia, Argentina, South America
Shores of Lake Myvatn at dusk, fine pseudo-crater in the distance, near Skutustadir, Myvatn, northern area, Iceland, Polar Regions
Aerial view of Mount Visoke (Mount Bisoke), an extinct volcano straddling the border of Rwanda and Democratic Republic of the Congo (DRC) showing crater lake, with Mount Mikeno in background, Virunga Volcanoes, Great Rift Valley, Africa
Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific
Kawah Ijen and its turquoise acid crater lake, Java, Indonesia, Southeast Asia, Asia
Sulphur worker appearing out of toxic fumes at Kawah Ijen, East Java, Indonesia, Southeast Asia, Asia
Aerial view of Hnausapollur (Blahylur), a volcanic crater near Landmannalaugar, Fjallabak Nature Reserve, Southern Region, Iceland, Polar Regions
Lake Assal crater lake in the central Djibouti with its salt pans, Afar Depression, Djibouti, Africa
Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia
Sunrise over Crater Lake and Wizard Island, Crater Lake National Park, Oregon, United States of America, North America
Rice terraces on eastern shore of crater lake, Lake Maninjau, West Sumatra, Sumatra, Indonesia, Southeast Asia, Asia
Kawah Ijen volcano slope (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
Crater Lake National Park, Oregon, USA
Worker loaded with big pieces of sulphur in front of steam clouds on the Ijen crater lake, Java, Indonesia, Southeast Asia, Asia
Crater Lake and Wizard Island at dawn, Crater Lake National Park, Oregon, United States of America, North America
Low clouds glowing orange at sunrise, Crater Lake National Park, Oregon, United States of America, North America
Kawah Ijen volcano ridge (Ijen crater), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia
Kawah Ijen volcano (Ijen crater and lake), Banyuwangi, East Java, Indonesia, Southeast Asia, Asia
Volcanic crater (rano), Rano Kau, Easter Island, Chile
Aerial of Lalolalo lake volcanic crater lake, center of Wallis, Wallis and Futuna, South Pacific, Pacific
Sunset at Crater Lake with Wizard Island, Crater Lake National Park, Oregon, United States of America, North America
The Blue Lake, a natural reservoir and one of three crater lakes at the top of Mt Gambier, an extinct volcano and town in the south east of the state, South Australia, Australia
View of the 300 meter deep crater called Viti off the north coast of Iceland, Polar Regions
Multi-coloured crater lakes at summit of Kelimutu volcano, eastern Flores, Nusa Tenggara, Indonesia, Southeast Asia, Asia
Multi-coloured crater lakes at summit of Kelimutu volcano, eastern Flores, Nusa Tenggara, Indonesia, Southeast Asia, Asia
Lagoa das Furnas crater in Furnas, San Miguel, Azores, Portugal, Europe
Wildlife, mossy trees, clouds and salt lake, Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania, East Africa, Africa
Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific
Crater lake Viti in winter, on Krafla volcano, Krafla geothermal area near Lake Myvatn, north Iceland, Iceland, Polar Regions
Acid Crater Lake, White Island Volcano, an active volcano in the Bay of Plenty, North Island, New Zealand, Pacific
Crater of Kelimutu Volcano, 1640m, Flores Island, Indonesia, Southeast Asia, Asia
Poas Volcano, Poas National Park, Costa Rica
Lake in summit crater formed in 1991 eruption, Pinatubo volcano, northern Luzon, Philippines, Southeast Asia, Asia
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Man fishing in front of Mount Baru Jari, Segara Anak Lake at the bottom of Mount Rinjani volcano crater, Lombok, Indonesia, Southeast Asia, Asia
The crater with active lava lake of Mount Nyiragongo, Virunga National Park, UNESCO World Heritage Site, Democratic Republic of the Congo, Africa
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Quilotoa Loop, volcanic crater lake, Ecuador, South America
Kawah Ijen's acidic turquoise blue crater lake, Java, Indonesia, Southeast Asia, Asia
Mount Naka active crater lake, Mount Aso, Kyushu, Japan, Asia
Kerid explosion crater with lake of green water, near Reykjavik, Iceland, Polar Regions
Rano Kau, Easter Island (Rapa Nui), Chile, South America
Shores of Lake Myvatn at dusk, fine pseudo-crater in the distance, near Skutustadir, Myvatn, northern area, Iceland, Polar Regions
Aerial view of smoke above the turquoise lake on crater of Kawah Ijen volcano, Banyuwangi, East Java, Indonesia
Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions
Lake inside a crater, Iceland.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.
November 2007 - Aerial view of crater lake in Tongariro volcanic complex, New Zealand.
November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.
January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
February 11, 2008 - Dallol geothermal area, 1926 explosion crater by Black Mountain, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
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
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
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Bingham Canyon Copper Mine, Salt Lake City, Utah, United States of America, North America
Lesser flamingos (Phoenicopterus minor) feeding on crater lake, 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
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
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
Aerial of a Volcanic crater outside, Goma, Democratic Republic of Congo, Africa