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Lake in the Furna do Enxofre, volcanic cave, Caldeira, Graciosa Natural Park, Graciosa Island, Azores, Portugal, Atlantic, Europe
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
Aerial of the volcanic crater with Lake Mazafim, island of Annobon, Equatorial Guinea, Africa
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 vertical view of old volcano and asphalt road, near to Myvatn lake on a summer day, Iceland, Polar Regions
Aerial of a Volcanic crater outside, Goma, Democratic Republic of Congo, Africa
The peak of Concepcion volcano and a black sand beach on Ometepe Island, Lake Nicaragua, Nicaragua, Central America
Quilotoa Lake, Cotopaxi Province, Ecuador
Trees and Lagoa Azul, Sete Cidades, Sao Miguel, Azores Islands, Atlantic, Portugal
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
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
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
Emerald Lake in Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Leirhnjukur thermal area and eruption site near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions
Aerial vertical view of old volcano and asphalt road, near to Myvatn lake on a summer day, Iceland, Polar Regions
Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, 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
Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North 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
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
Sunrise above the Emerald Lakes, view from red crater, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Tourists around the hot mud pools at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
View of Lake Toya, framed by autumn trees in the evening, and volcanic island in the middle of the lake, Abuta, Hokkaido, Japan, Asia
One of the Emerald Lakes, explosion craters filled with mineral-tinted water, on Mount Tongariro in the Tongariro National Park on the central plateau, North Island, New Zealand
Volcano Osorno and Lake Lanquihue (Llanquihue), Chile, South America
Path to Laguna Miscanti, a brackish lake at an altitude of 4140 meters in the Andean Central Volcanic Zone, Chile, South America
Tourists around the steam jets at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Sulphur vents, Mount Asahidake, island of Hokkaido, Japan, Asia
Volcanic rock formations on the shores of White Lake, Tariat district, North Hangay province, Mongolia, Central Asia, Asia
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
The Blue Crater Lake of Viti, which appeared after an eruption in 1875, part of the sulphurous geothermal area of Namafjall, Reykjahlio, Iceland
Beautiful autumn landscape of fire red leaves and soft blue volcanic lake, Lake Usori at Osorezan Bodaiji Temple, Mutsu, Aomori prefecture, Honshu, 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
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
The volcanic lake Lagoa do Congro with its emerald water, Sao Miguel Island, Azores Islands, Portugal, Atlantic, Europe
Crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America
Path to Laguna Miscanti, a brackish lake at an altitude of 4140 meters in the Andean Central Volcanic Zone, Chile, South America
Lake Atitlan and volcano, Atitlan, Guatemala, Central America
Crater of Ranu Kau, Rapa Nui (Easter Island), Chile, South America
Aerial vertical view of old volcano near to Myvatn lake on a summer day, Iceland, Polar Regions
Crater lake in the Poas volcano, San Jose, Costa Rica, Central America
Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe
Steam jet at Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Volcanic panorama Lake Usori in autumn, Mutsu, Aomori prefecture, norhtern Honshu, Japan, Asia
Viti Crater, Krafla, Iceland, Polar Regions
Refuge hut at Laguna Miscanti, a brackish lake at an altitude of 4140 meters, Central Volcanic Zone, Chile, South America
Namaskard thermal area, Hverarond, near Lake Myvatn, North area, Iceland, Polar Regions
Vibrant autumn colors on Lake Toya, volcanic lake with trees on a sandy shore, Abuta, Hokkaido, Japan, Asia
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
Grjotagja cave near Lake Myvatn in Iceland, Europe
El Sod Crater lake, Southern Ethiopia, Africa
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
Monsoon clouds gathering over hotel on the edge of the still waters of volcanic Lake Toba, Sumatra
Lagoa Comprida volcanic lake surrounded by vegetations and ginger lily flowers on a sunny day, Flores island, Azores islands, Portugal, Atlantic Ocean, Europe
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
Poas Volcano, Poas National Park, Costa Rica
The huge 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
The caldera of Lake Mashu, Akan National Park, Hokkaido, 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
A view of the volcanic crater and colourful crater lake on Santa Ana Volcano in Santa Ana, El Salvador, Central America
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
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
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
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
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
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
Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, 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
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
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America
Steam plume off boiling acid lake, Naka-dake active crater, Aso volcano, Kyushu, Japan, Asia
Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Ryan Lake and some of the millions of trees north of Mount St. Helens flattened by the eruption of 1980, Mount St. Helens National Volcanic Monument, Washington State, 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
Smoke billowing out from volcano vent, Sulphur Lake, Kawah Ijen, Ijen Plateau, Java, Indonesia, Southeast Asia, Asia
Lake Azul and the village of Sete Cidades inside the Sete Cidades volcanic crater, San Miguel, Azores, Portugal, Europe
Looking south towards Lake Helen from dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activities and features, Lassen Volcanic Park, Northern California, California, United States of America (USA), North America
Tiwu Ata Mbupu (Lake of Old People) one of three crater lakes on the summit of Mount Kelimutu on Flores island, Indonesia.
Sunrise over Tiwu Ko'o Fai Nuwa Muri, one of three crater lakes on the summit of Mount Kelimutu on Flores island, Indonesia.