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Third crater, created in 1994 and containing green lake, Irazu Volcano, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America
Panoramic view of trees and mountains in desert landscape, Namib Rand game reserve, Namib Naukluft Park, Namibia, Africa
Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America
Prayer flags on top of low pass on Barga Plain, with Mount Kailas (Kailash) beyond, sacred mountain for Buddhists and Hindus, Tibet, China, Asia
Yak train approaches Tarboche, prayer flag pole in Lha Chu canyon, on the kora round sacred mountain, Mount Kailas (Kailash), Tibet, China, Asia
Panoramic view over orange sand dunes towards mountains, Namib Rand private game reserve, Namibia, Africa
Aerial view of Himalaya mountain range, with Nanga Parbat, 8125m, seen from south west, rising above other mountains, Pakistan, Asia
Aerial view of the South Rim, Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, USA, North America
Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America
West Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America
View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America
Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America (U.S.A.), North America
El Tatio geyser basin on altiplano, boiling pool with algal colour zoning, Atacama Desert, Chile, South America
Panoramic view over orange sand dunes towards the mountains, Namib Rand private game reserve, Namibia, Africa
Panoramic view of mountains and dune glowing in last light before sunset, Namib Rand, Namib Naukluft Park, Namibia, Africa
Pueblo Bonito from 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America
West Rim at sunrise, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America
Panoramic view of sunset over mountains in the Namib Rand private reserve, Namib Desert, Namibia, Africa
Backpacker walking across dried up lake towards Llaima volcano, Conguillio National Park, Chile, South America
Panoramic view of volcanic landscape near the village of Cavusin, near Goreme, Cappadocia, Anataolia, Turkey, Asia Minor, Asia
Panoramic view over dunes and mountains, Namib Rand, Namib Naukluft Park, Namib Desert, Namibia, Africa
Camel train, Khongryn dunes, Gobi desert, Gobi National Park, Omnogov Province, Mongolia, Central Asia, Asia
Sandstone Wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America
Mountain range outside city of Huaraz, the tallest peaks in Peru, Cordillera Blanca, Andes, Peru, South America
Indus River at Skardu looking downstream, Mount Marshakala, 5150m, Mashabrum Range, Karakorams, Baltistan, Pakistan, Asia
Woman carrying firewood, on the Annapurna circuit trek just west of Jharkot. Easter 2005, Nepal, Asia
Griggs volcano overlooks Valley of Ten Thousand Smokes filled by ash in 1912 eruption of Katmai, Katmai Volcano National Park, Alaska, USA, North America
Panoramic view of orange sand dune and blue sky, Namib Rand, a 500000 acre private game reserve in the Namib Naukluft Park, Namibia, Africa
View from Yavapai Point, in evening light, Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America
Rock climber attempts bouldering, and volcano in background, Conguillio National Park, Chile, South America
Colourful volcanic rock, Mount Tarawera, Rotorua, South Auckland, North Island, New Zealand, Pacific