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Favignana, Egadi Islands, Sicily, Italy, Mediterranean, Europe
Sand dunes, Erg Murzuq, Sahara desert, Fezzan, Libya, North Africa, Africa
Royal tomb, Petra, UNESCO World Heritage Site, Jordan, Middle East
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Flamborough Head, East Yorkshire, Yorkshire, England, United Kingdom, Europe
Pars-kamor lighthouse, Ploumanach, Breton Corniche, Cote de Granit Rose, Cotes d'Armor, Brittany, France, Europe
Hot water pools in this area of geothermal activity, Geysir, Iceland, Polar Regions
Faraglioni Rocks, Capri, Campania, Italy, Mediterranean, Europe
Steam plume off boiling acid lake, Naka-dake active crater, Aso volcano, Kyushu, Japan, Asia
Sacred Valley of the Inca, Urubamba, Peru, South America
Natural rock arch, desert scenery, Wadi Rum, Jordan, Middle East
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
Lava flow from the Monti Calcarazzi fissure on the southern flank of Mount Etna in 2001, threatening the town of Nicolosi below, Sicily, Italy, Europe
Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe
Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Blyde River Canyon, Mpumalanga, South Africa, Africa
Hverir geothermal fields at the foot of Namafjall mountain, Myvatn lake area, Iceland, Polar Regions
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Severe erosion of loose Quaternary glacial sands on this coast that has retreated more than 500m since the1830s, Covehithe, Suffolk, England, United Kingdom, Europe
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Forested hills and snow capped mountains at Tianshan near Sayram Lake in Xinjiang, China, Asia
Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America
Calcium formations, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, 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
Fox Glacier, Westland, west coast, South Island, New Zealand, Pacific
Natural bridge, Aruba, Antilles, Central America
Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Volcanic stratified rocks, Parque Nacional del Teide, Tenerife, Canary Islands, Spain, Europe
Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America
The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
Stoura Pund cliffs and stacks of red sandstone, Eshaness, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Hikers at Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Landscape typical of the region, with spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Rock arches and cliffs at Ponte da Piedade near Lagos, Algarve, Portugal, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Atta Cave near Attendorn, Sauerland, North Rhine-Westphalia, Germany, Europe
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific
Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe
The Siq, Petra, UNESCO World Heritage Site, Jordan, Middle East
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
Limestone pinnacles in Shilin, Stone Forest, in Lunan, Yunnan Province, China, Asia
The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
View from the Copper Canyon train, Mexico, North America
Colourful volcanic landscape, Tupiza, Southern Altiplano, Bolivia, South America
Na Pali, north coast of the island of Kauai, Hawaii, United States of America, Pacific, North America
St. Ninian's Isle tombolo, connecting St Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Rocky Coast and Yesnaby castle, a sea stack, near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Outer crater and the small scoria cone, Formica leo, Piton de la Fournaise, Reunion, Africa
Chesil Bank, Dorset, England, United Kingdom, Europe
Zhijin Cave, the largest in China at 10 km long and 150 high, Guizhou Province, China, Asia
View of sedimentary layers from Cape Hay, Bylot Island, Nunavut, Canada, North America
Torrey Pines State Beach, San Diego, California, United States of America, North America
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Laugahraun lava field seen from the slopes of Blahnukur, Landmannalaugar area, Fjallabak region, Iceland, Europe
Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe
Waterfall in summer sunshine at Foss a Sidu, South coast, Iceland, Polar Regions
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
Steam rising from hot springs at Krisuvik on the south west peninsula of Iceland, Polar Regions
Landscape of snow-covered snow gums, mountainsand clouds, seen from Mount Buller, High Country, Victoria, Australia, Pacific
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific
Thassos (Thasos), Aegean Islands, Greek Islands, Greece, Europe
Karst limestone sceney, Ziyun, Guizhou, China, Asia
Early morning light on the Pinnacles, Handfast Point, Studland, Dorset, England, United Kingdom, Europe
Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Landscape with fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Eurasia
Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America
Sea and salt formations with hotels and desert cliffs beyond, Ein Bokek Hotel Resort, Dead Sea, Israel, Middle East
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Rocky coast near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
One of many picturesque waterfalls in the valley of the Rio Pastaza that flows from the Andes to the upper Amazon Basin, near Banos, Ambato Province, Central Highlands, Ecuador, South America
Algar do Carvao Caves, Terceira Island, Azores, Portugal, Europe
Crater lake at Manengouba, Western Cameroun, Cameroon, Africa
Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Skocjan caves, UNESCO World Heritage Site, Slovenia, Europe
Red Tsingys, strange looking sandstone formations, near Diego Suarez (Antsiranana), Madagascar, Africa
Tourists at Valle de la Luna (Valley of the Moon), La Paz, La Paz Department, Bolivia, South America
Rio Grande Gorge Bridge near Taos, New Mexico, United States of America, North America
Blue Grotto near Zurrieq, Malta, Mediterranean, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Pont d'Arc, natural arch over the Ardeche River, Ardeche, Rhone-Alpes, France, Europe
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Hiker on walkways admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Uri, Switzerland, Europe
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Cliffs of the Alabaster Coast near Etretat in Seine Maritime, Haute Normandie, France, Europe
Faces in the rocks, Le Pere Trebeurden, at Trebeurden on the Cote de Granit Rose on the Cotes d'Amor, Brittany, France, Europe