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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 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.
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.
Licancabur stratovolcano reflected in Laguna Tebinquinche, Chile.
The Pura Bratan Hindau Shiva temple next to Catur volcano on the shore of Bratan Lake, Bali, Indonesia, Southeast Asia, Asia
Active Concepcion Volcano seen from Merida in the island's Southeast, Merida, Volcan Maderas, Omotepe Island, Lake Nicaragua, Nicaragua, Central America
The 1610m Volcan Concepcion looms behind port of Moyogalpa in west of the island, Moyogalpa, Isla Omotepe, Lake Nicaragua, Nicaragua, Central America
Lava lake in the caldera of the Ambrym volcano, Vanuatu, Pacific
Khorgo volcano crater and White Lake in the background, Tariat district, North Hangay province, Mongolia, Central Asia, Asia
Lagoa das Sete Cidades, elevated view, Sao Miguel Island, Azores, Portugal, Atlantic, Europe
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
Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Aerial view by airplane of incredible turquoise volcanic Skafta lake in Icelandic Highlands, Iceland, Polar Regions
Aerial view by airplane of incredible turquoise volcanic Skafta lake in Icelandic Highlands, Iceland, Polar Regions
Aerial of the Trou du Natron volcanic crater and its natron lakes, Tibesti Mountains, Chad
Close up of turquoise, vibrant Emerald Lake with steaming volcano, 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
Aerial of the volcanic crater with Lake Mazafim, island of Annobon, Equatorial Guinea, Africa
Aerial vertical view of old volcano and asphalt road, near to Myvatn lake on a summer day, Iceland, Polar Regions
The peak of Concepcion volcano and a black sand beach on Ometepe Island, Lake Nicaragua, Nicaragua, Central America
Mount Fujiyama (Mount Fuji), UNESCO World Heritage Site, ice capped volcano with a clear blue lake in fireground in autumn, Honshu, Japan, Asia
Arenal Volcano behind Laguna de Arenal (Arenal Lake), Alajuela Province, Costa Rica, Central America
Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Aerial vertical view of old volcano and asphalt road, near to Myvatn lake on a summer day, Iceland, Polar Regions
Mount Fuji San, UNESCO World Heritage Site, iconic volcano, with vibrant autumn foliage in front of a blue lake, Honshu, Japan, Asia
The 1610m active Volcan Concepcion, greater of two volcanoes that form popular Omotepe Island (Isla Omotepe), Lake Nicaragua, Nicaragua, Central America
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 on Tongariro Crossing, 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
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
Emerald Lake in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Sulphur vents, Mount Asahidake, island of Hokkaido, Japan, Asia
Sunrise above the Emerald Lakes, view from red crater, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Boat and boat house in lake Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
Volcano Arenal, seen from Lake Arenal, Costa Rica, Central America
The three emerald lakes and volcano landscape of the Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Volcano Osorno and Lake Lanquihue (Llanquihue), Chile, South America
View of Lake Toya, framed by autumn trees in the evening, and volcanic island in the middle of the lake, Abuta, Hokkaido, Japan, Asia
Arenal Volcano behind Laguna de Arenal (Arenal Lake), Alajuela Province, Costa Rica, Central America
Lakeside scene and Volcan Concepcion at Merida in island's South East, Merida, Volcan Maderas, Omotepe Island, Lake Nicaragua, Nicaragua, Central America
The forested side of the 1610m active Volcan Concepcion seen from the east of the island, Isla Omotepe, Lake Nicaragua, Nicaragua, Central America
Arenal Volcano, Alajuela Province, Costa Rica, Central America
Lake Atitlan and volcano, Atitlan, Guatemala, Central America
A couple of flamingos fishing in the still waters of a lagoon with a volcano of the Andes in the background, Chile, South America
A group of 30 wind turbines by Lake Nicaragua, Nicaragua's first such facility name Amayo) with Concepcion Volcano beyond, Rivas, Nicaragua, Central America
Lagoa das Sete Cidades, elevated view, Sao Miguel Island, Azores, Portugal, Atlantic, Europe
Volcano Gunung Batur crater lake, Bali, Indonesia, Southeast Asia, Asia
Crater lake in the Poas volcano, San Jose, Costa Rica, Central America
Viti Crater, Krafla, Iceland, Polar Regions
Lake Quilotoa at sunset, Cotopaxi Province, Ecuador, South America
Vibrant autumn colors reflecting in Lake Onuma, with view to Hokkaido Koma-ga-take volcano, Onuma, Hokkaido, Japan, Asia
Volcanic panorama Lake Usori in autumn, Mutsu, Aomori prefecture, norhtern Honshu, Japan, Asia
Ferry and the twin peaks of Omotepe Island's volcanoes Concepcion on left and Maderas, Isla Omotepe, Lake Nicaragua, Nicaragua, Central America
Arenal Volcano, Alajuela Province, Costa Rica, Central America
Lake Quilotoa, Cotopaxi Province, Ecuador, South America
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
Aerial vertical view of old volcano near to Myvatn lake on a summer day, Iceland, Polar Regions
A solitary flamingo flying above the still waters of a lagoon with a volcano of the Andes in the background, Chile, South America
Lake Quilotoa, Cotopaxi Province, Ecuador, South America
Vibrant autumn colors on Lake Toya, volcanic lake with trees on a sandy shore, Abuta, Hokkaido, Japan, Asia
Lanin volcano and Lago Huechulafquen, Lanin National Park, near Junin de los Andes, The Lake District, Argentina, South America
A view of the volcanic crater and colourful crater lake on Santa Ana Volcano in Santa Ana, El Salvador, Central America
El Sod Crater lake, Southern Ethiopia, Africa
Kerid Crater, a frozen lake occupying a Volcano, Iceland, Polar Regions
Arenal Volcano, Alajuela Province, Costa Rica, Central America
Sunrise over lake Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
Rainforest landscape at sunrise, Arenal Volcano National Park, Alajuela Province, Costa Rica, Central America
Poas Volcano, Poas National Park, Costa Rica
A view of Coatepeque Lake in Santa Ana, El Salvador, Central America
Smoking Kilauea Summit Lava Lake in the Hawaii Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific
Sunset over lake Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
Arenal Volcano behind Laguna de Arenal (Arenal Lake), Alajuela Province, Costa Rica, Central America
Poas Volcano, Poas National Park, Costa Rica
Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
Lanin volcano and Lago Huechulafquen, Lanin National Park, near Junin de los Andes, The Lake District, Argentina, South America
Arenal Volcano, Alajuela Province, 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
Cotopaxi Volcano in clouds, Cotopaxi National Park, Cotopaxi Province, Ecuador, South America
View over the forest slope of Lake Toya in the evening with volcano in the distance, Abuta, Hokkaido, Japan, Asia
Limpiopungo lake and Cotopaxi volcano, Cotopaxi National Park, Andes mountains, Ecuador, South America
View over the church to lake Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
View over the church to lake Llanquihue and Volcan Osorno, Puerto Varas, Chilean Lake District, Los Lagos, Chile, South America
Lake Arenal and Volcano Arenal, in Arenal National Park, Alajuela Province, San Carlos, Costa Rica, Central America
View from above onto Lake Toya and the island inside the crater, in autumn, Abuta, Hokkaido, Japan, Asia
Chile, tourists visiting the osorno volcano and lake in the southern region.
Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America