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Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Chesil Bank, Dorset, England, United Kingdom, Europe
Torrey Pines State Beach, San Diego, California, United States of America, North America
Skocjan caves, UNESCO World Heritage Site, Slovenia, Europe
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Hverir geothermal fields at the foot of Namafjall mountain, Myvatn lake area, Iceland, Polar Regions
Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
The Siq, Petra, UNESCO World Heritage Site, Jordan, Middle East
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Steam rising from hot springs at Krisuvik on the south west peninsula of Iceland, Polar Regions
Faces in the rocks, Le Pere Trebeurden, at Trebeurden on the Cote de Granit Rose on the Cotes d'Amor, Brittany, France, Europe
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
Fox Glacier, Westland, west coast, South Island, New Zealand, Pacific
Travertine terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor
Yellow and orange volcanic rock, Nisyros (Nisiros) (Nissyros), Dodecanese islands, Greece, Mediterranean, Europe
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Salt desert of Uyuni, Bolivia, South America
Thassos (Thasos), Aegean Islands, Greek Islands, Greece, Europe
Karst limestone sceney, Ziyun, Guizhou, China, Asia
Queen's Head, coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America
Eternal fire of the Chimera, Olympus, Turkey, Eurasia
Tourists on terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Na Pali, north coast of the island of Kauai, Hawaii, United States of America, Pacific, North America
The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
Harrisons Cave, Barbados, West Indies, Caribbean, Central America
Sulphur springs, Soufriere, St. Lucia, Windward Islands, West Indies, Caribbean, Central America
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
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
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Cliff detail, Hells Gate, Kenya, East Africa, 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
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific
Tourists at Valle de la Luna (Valley of the Moon), La Paz, La Paz Department, Bolivia, South America
Laugahraun lava field seen from the slopes of Blahnukur, Landmannalaugar area, Fjallabak region, Iceland, Europe
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, Death Valley National Park, California, United States of America, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Landscape of the Swat River valley in Pakistan, Asia
Limestone pinnacles in Shilin, Stone Forest, in Lunan, Yunnan Province, China, 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
Peaks and high valleys on the side of the Cares Gorge, Picos de Europa, Cantabria, Spain, Europe
The smoking Volcan Villarrica, 2847m, Lake District, Chile, South America
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
View from the caldera of the volcano of Pico de Fogo, Fogo (Fire), Cape Verde Islands, Africa
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
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
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
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
Glacier on southeast coast, South Georgia, Polar Regions
Rock formations, Kaleto fortress, Belogradchik, Bulgaria, Europe
Terraced thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Arenal volcano, La Fortuna, Costa Rica, Central America
Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions
Waterfall in summer sunshine at Foss a Sidu, South coast, Iceland, Polar Regions
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
View of outside thermal spa at Szechenhu Thermal Bath in winter, Budapest, Hungary, Europe
Close-up of dinosaur footprint, Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America
Painted landscape in the Gurbantinggut Desert in Xinjiang, China, Asia
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
Mount Cook, at 3755m, the highest mountain in N.Z., Canterbury, South Island, New Zealand, Pacific
Walkers on a narrow mountain road above the Cares Gorge, 1000m deep, 12km limestone gorge, in the Picos de Europa mountains in Cantabria, Spain, Europe
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Aletschglacier, with Jungfrau and Monch mountains in background, Bernese Alps from south, Switzerland, Europe
Badlands from Zabriskie Point, looking west, Death Valley National Monument, California, United States of America (U.S.A.), North America
Volcanic rocks and beach at Paleokori, southern coast, Milos, Cyclades islands, Greece, Mediterranean, Europe
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Elephant rock, Castelsardo, Sassari province, island of Sardinia, Italy, Mediterranean, Europe
Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Faraglioni Rocks, Capri, Campania, Italy, Mediterranean, Europe
Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, UNESCO World Heritage Site, Eastern Siberia, Russia, Eurasia
Koryaksky volcano. UNESCO World Heritage Site, behind Stalinist suburban flats, Petropavlovsk, Kamchatka, Eastern Siberia, Russia, Eurasia
Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America
Grotte de l'Observatoire, Jardin Exotique, Moneghetti, Monaco, Europe
Monument Valley Navajo Tribal Park, Utah Arizona border, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border area, United States of America, North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
The world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
Yesnaby Castle sea stack, rock eroded by the sea, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Perce, Gaspe peninsula, province of Quebec, Canada, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Horseshoe Bend, Colorado River, near Page, Arizona, United States of America, North America
Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe
Volcanic landscape, Isla de los Lobos, Fuerteventura, Canary Islands, Spain, Europe
Lighthouse Meen Ruz, Ploumanach, Cote de Granit Rose, Cotes d'Armor, Brittany, France, Europe
Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Blue Grotto near Zurrieq, Malta, Mediterranean, Europe
Red Rock Canyon outside Las Vegas, Nevada, United States of America, North America
Eldfell Volcano, created in 1973, Heimaey, Westman Islands, Iceland, Polar Regions