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Tourists around the steam jets at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
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.
November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
January 21, 2011 - Small fountains in lava lake, Nyiragongo Volcano, Democratic Republic of the Congo.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
Licancabur stratovolcano reflected in Laguna Tebinquinche, Chile.
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
Boy fishing on dock by changing colour Lake Linow, a popular volcanic attraction and geothermal centre south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Brahmin cow grazing lush grass on fertile soils at Lake Linow in this volcanic area near Tomohon, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America
Aerial view taken by drone of Skyggnisvtn lake in Landmannalaugar area, during a summer day, 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. 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 - 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 - 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, 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.
Poas volcano, Poas National Park, Costa Rica, Central America
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Mount Eystrahorn in winter, Krossanesfjall Mountains, Iceland
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica
Sulphur and other minerals at an active fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
The Blue Crater Lake of Viti, which appeared after an eruption in 1875, part of the sulphurous geothermal area of Namafjall, Reykjahlio, Iceland
Volcano Osorno and Lake Lanquihue (Llanquihue), Chile, South America
Crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America
Aerial of a Volcanic crater outside, Goma, Democratic Republic of Congo, Africa
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Refuge hut at Laguna Miscanti, a brackish lake at an altitude of 4140 meters, Central Volcanic Zone, Chile, South America
Emerald Lake in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Beautiful autumn landscape of fire red leaves and soft blue volcanic lake, Lake Usori at Osorezan Bodaiji Temple, Mutsu, Aomori prefecture, Honshu, Japan, Asia
Crater lake in the Poas volcano, San Jose, Costa Rica, Central America
A view of the volcanic crater and colourful crater lake on Santa Ana Volcano in Santa Ana, El Salvador, Central America
Path to Laguna Miscanti, a brackish lake at an altitude of 4140 meters in the Andean Central Volcanic Zone, Chile, South America
Steaming fumaroles by Lake Linow, a popular volcanic attraction and geothermal centre south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Boiling water at a steaming fumarole field by Lake Linow, a volcanic attraction south of Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Steam jet at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Aerial vertical view of old volcano near to Myvatn lake on a summer day, Iceland, Polar Regions
Grjotagja cave near Lake Myvatn in Iceland, Europe
Viti Crater, Krafla, Iceland, Polar Regions
Lake Atitlan and volcano, Atitlan, Guatemala, Central America
El Sod Crater lake, Southern Ethiopia, Africa
Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe
Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Volcanic crater before the smoking Kilauea Summit Lava Lake in the Hawaii Volcanoes National Park,UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific
The caldera of Lake Mashu, Akan National Park, Hokkaido, Japan, Asia
The huge caldera of the Crater Lake National Park, Oregon, United States of America, North America
Monsoon clouds gathering over hotel on the edge of the still waters of volcanic Lake Toba, Sumatra
Volcanic panorama Lake Usori in autumn, Mutsu, Aomori prefecture, norhtern Honshu, Japan, Asia
Poas Volcano, Poas National Park, Costa Rica
The caldera of Lake Mashu, Akan National Park, Hokkaido, Japan, Asia
The caldera of Lake Mashu, Akan National Park, Hokkaido, Japan, Asia
Vibrant autumn colors on Lake Toya, volcanic lake with trees on a sandy shore, Abuta, Hokkaido, Japan, Asia
The huge caldera of the Crater Lake National Park, Oregon, United States of America, North America
The caldera of the Crater Lake National Park, Oregon, United States of America, North America
The caldera of Lake Mashu, Akan National Park, Hokkaido, Japan, Asia
Tourist on the path to Laguna Miscanti, a brackish lake at an altitude of 4140 meters, Central Volcanic Zone, Chile, South America
A view of the volcanic crater and colourful crater lake on Santa Ana Volcano in Santa Ana, El Salvador, Central America
Poas Volcano, Poas National Park, Costa Rica
Laguna Miscanti, a brackish lake at an altitude of 4140 meters in the Andean Central Volcanic Zone, Chile, South America
Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North America
Charco de los Clicos lake at sunset, bay of El Golfo, Lanzarote, Canary Islands, Spain, Atlantic, Europe
El Sod crater lake, South Omo Valley, Ethiopia, Africa
Lake Terkhiin Tsagaan Nuur, volcanic region of Khorgo, Arkhangai, Mongolia, Central Asia, Asia
Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America
Spirit Lake in the landscape north of Mount St. Helens devastated by the 1980 eruption, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, Asia
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America
Smoke billowing out from volcano vent, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia
Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia
One of three crater lakes at the summit of Kelimutu volcano near Moni, soil chemical creates the unusual colours, island of Flores, Indonesia, Southeast Asia, Asia
The smoking crater of Volcan Villarrica, 2847m, Lake District, Chile, South America
Lake Terkhiin Tsagaan Nuur, volcanic region of Khorgo, Arkhangai, Mongolia, Central Asia, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Man carrying a huge plantain on his head, volcanic lake Barombi, Kumba, southwest Cameroon, Africa
Man carrying a huge plantain on his head, volcanic lake Barombi, Kumba, southwest Cameroon, Africa
Steam chimneys, pipes and workers at a volcanic power facility run by Pertamina Geothermal Energy near Tomohon City, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia
Thousands of trees blown down by the 1980 eruption still floating on Spirit Lake north of the mountain, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Steam plume off boiling acid lake, Naka-dake active crater, Aso volcano, Kyushu, Japan, Asia
Workers in hard hats by steam pipes and valves at a volcanic facility run by Pertamina Geothermal Energy near Tomohon city, Lake Linow, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia