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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
Mt. Fuji and Yamanaka ko (lake), Yamanashi, Japan
Mt. Fuji and Yamanaka ko (lake), Yamanashi, Japan
Mt. Fuji and Yamanaka ko (lake), Yamanashi, Japan
Wooden jetty and volcanoes in the distance, Lago Atitlan (Lake Atitlan), Guatemala, Central America
Aerial of a tuquoise crater lake on top of Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Volcanic cone and Situ Cangkuang lake by this village, known for its Hindu temple, Kampung Pulo, Garut, West Java, Indonesia, Southeast Asia, Asia
Cerro Catedral and Lago Toncek, Nahuel Huapi National Park, Bariloche, Patagonia, Argentina, South America
Kawah Ijen and its turquoise acid crater lake, Java, Indonesia, Southeast Asia, Asia
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park in southeast Iceland, Polar Regions
Very active lava lake of Erta Ale shield volcano, Danakil depression, Ethiopia, Africa
Very active lava lake of Erta Ale shield volcano, Danakil depression, Ethiopia, Africa
Aerial view of Hnausapollur (Blahylur), a volcanic crater near Landmannalaugar, Fjallabak Nature Reserve, Southern Region, Iceland, Polar Regions
Arenal Volcano and Arenal Lake at sunset, near La Fortuna, Alajuela Province, Costa Rica, Central America
Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia
Batak Houses at Lake Toba (Danau Toba), the largest volcanic lake in the world, North Sumatra, Indonesia, Southeast Asia, Asia
Backpacker walking across dried up lake towards Llaima volcano, Conguillio National Park, Chile, South America
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
Andean volcanic landscape near the Blue Lake (Laguna Celeste), Eduardo Avaroa National Reserve, Los Lipez, Southwest Bolivia, South America
Volcanic crater (rano), Rano Kau, Easter Island, Chile
Aerial of Lalolalo lake volcanic crater lake, center of Wallis, Wallis and Futuna, South Pacific, Pacific
Volcanic cones, palm trees and lake in rural area near Kampung Pulo, Kecamatan Leles, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
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 from the San Pedro volcano of San Pedro and Lago Atitlan (Lake Atitlan), Guatemala, Central America
Lake Helen and Mount Lassen, 3187 meters, in the background, Lassen Volcanic National Park, California, United States of America, North America
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
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park, southeast Iceland, Polar Regions
Lassen Volcanic National Park, California, United States of America, North America
Lake Toba (Danau Toba), the largest volcanic lake in the world, North Sumatra, Indonesia, Southeast Asia, Asia
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park in southeast Iceland, Polar Regions
Volcano and wind swept trees, Lake District, Puyehue National Park, southern Chile, Chile, South America
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park in southeast Iceland, Polar Regions
Frying Pan Lake,the largest hot spring in the world, Waimangu Volcanic Valley, North Island, New Zealand, Pacific
Hellen Lake with Mount Lassen, 3187 m, in the background, Lassen Volcanic National Park, California, United States of America, North America
Poas Volcano, Poas National Park, Costa Rica
Volcano of Parinacola, 6348m high, reflected in water of Chungara Lake, Parque Nacional de Lauca, Chile, South America
Quilotoa Loop, volcanic crater lake, Ecuador, South America
Petrohue Falls and Osorno Volcano, Vicente Perez Rosales National Park, Chilean Lake District, Chile, South America
Fishing boat on Lake Toba (Danau Toba), the largest volcanic lake in the world, North Sumatra, Indonesia, Southeast Asia, Asia
Tourists sunbathing on the volcanic sand beach on Lago Villarrica, Pucon, Chile, South America
Icebergs on a black sand volcanic beach next to the Jokulsarlon glacial lake in Vatnajokull National Park in southeast Iceland, Polar Regions
View over Lake Rotomahana, Waimangu Volcanic Valley, North Island, New Zealand, Pacific
Island view from Puyehue volcano, Lago Puyehue (Lake Puyehue), Chile, South America
Volcanic lake and the coast of Nosy Be from Mont Passot, Madagascar, Indian Ocean, Africa
Snow covered frozen Viti (Hell) crater near Krafla power plant, Lake Myvatn, North area, Iceland, Polar Regions
Hot pools and boiling mud at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Aerial view by airplane of incredible turquoise volcanic Skafta lake in Icelandic Highlands, Iceland, Polar Regions
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 - Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Orange coloration in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
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 22, 2011 - Lava Lake in bottom of summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.
January 22, 2011 - Lava Lake with small lava fountains, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Small fountains in lava lake, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Lava rafts floating on lava lake in summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of summit caldera with lava lake, Nyiragongo Volcano, Democratic Republic 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.
Licancabur stratovolcano reflected in Laguna Tebinquinche, Chile.
Construction of traditional style Batak house with bamboo scaffolding, beside the volcanic Lake Toba, 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
Rice paddy fields, with heavy monsoon clouds gathering over volcanic crater hills across Lake Toba from Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Construction of traditional style Batak house with bamboo scaffolding, beside the volcanic Lake Toba, Samosir Island, Sumatra, Indonesia, Southeast Asia, Asia
Aerial drone view of particular ice textures formed in the Svinafellsjokull glacier following global warming, Iceland, Polar Regions
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
Lake Toba, Sumatra, Indonesia, Southeast Asia
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Grjotagja cave near Lake Myvatn in Iceland, Europe
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
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
Quilotoa Lake, Cotopaxi Province, Ecuador
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Lake in the Furna do Enxofre, volcanic cave, Caldeira, Graciosa Natural Park, Graciosa Island, Azores, Portugal, Atlantic, Europe