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Asir province, Saudi Arabia, Middle East
The Bandiagara escarpment, Dogon area, Mali, Africa
Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe
Sedimentary rocks, blue lias, shale-limestone sequences, Lyme Regis, Jurassic coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America
Migrating barchan sand dunes across road marked by buried telegraph poles, Kharga basin, Western Desert, Egypt, North Africa, Africa
Limestone Stone Forest, near Kunming, Yunnan province, China, Asia
A sand avalanche after a rainstorm in the Sahara Desert, Algeria, North Africa, Africa
The world's finest travertine dams, Huanglong (Yellow Dragon), UNESCO World Heritage Site, northern Sichuan, Sichuan, China, Asia
Aerial view of the Iguassu Falls, Iguassu National Park, UNESCO World Heritage Site, Parana, Brazil, South America
Glencoe and the Three Sisters, Highland region, Scotland, United Kingdom, Europe
The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe
The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe
A burn in Dukes Pass, The Trossachs, Stirling, Central, Scotland, United Kingdom, Europe
Flowering plants and rock formations, Koprolu National Park, Antalya, Anatolia, Turkey, Eurasia
Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Mount Osorno, a volcano in Vicente Rosales National Park, Lake District, Chile, South America
Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater lakes, Afghanistan's first National Park, Bamian province, Afghanistan, Asia
The Matterhorn, 4478m, from the east, over Riffel Lake, Swiss Alps, Switzerland, Europe
Flock of sheep, northeast coast of Lake Van, Van area, Anatolia, Turkey, Asia Minor, Eurasia
Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America
Blue Nile Falls, near Lake Tana, Gondar region, Ethiopia, Africa
Tourists climbing at Wadi Rum, Jordan, Middle East
Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America
Upstream end seen from Fengjie, Qutang Gorge, Three Gorges, Yangtze River, China, Asia
Tourist boat in the Longmen Gorge, first of the Small Three Gorges, Yangtze Gorges, China, Asia
Sand dunes, desert scenery, Wadi Rum, Jordan, Middle East
Pigeon rocks (Rawcheh rocks), Beirut, Lebanon, Middle East
Antelope Canyon, a slot canyon, Upper Canyon, Page, Utah, United States of America, North America
Remarkable Rocks, Kangaroo Island, South Australia, Australia, Pacific
Remarkable Rocks, Kangaroo Island, South Australia, Australia, Pacific
Waterfall on the Colorado River, Hacienda Guachipelin, near Rincon de la Vieja National Park, Guanacaste, Costa Rica, Central America
Lagoa Azul (Blue Lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South America
View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia
Icebergs, Weddell Sea, Antarctic Peninsula, Antarctica, Polar Regions
Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island', Hawaii, United States of America, North America
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe
Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe
Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
Black Fort, Aran Islands, County Galway, Connacht, Republic of Ireland (Eire), Europe
Da Nort Bank, natural arches and cliffs, Foula, Shetland Islands, Scotland, United Kingdom, Europe
Wadi Bani Awf, Djebel Akhdar, Western Hajar mountains, rising to 3000m, Oman, Middle East
Sunset at Eshaness basalt cliffs, with Moo Stack on left, and deeply eroded coast with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Limestone pavements near Chapel-le-Dale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Slieve League, the highest cliffs in Europe, Bunglass Point, County Donegal, Ulster, Republic of Ireland (Eire), Europe
Monk's Cowl Valley, Drakensberg, South Africa, Africa
Close-up of pitch at the world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific
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
Lake Hawea, 384m deep, Otago, South Island, New Zealand, Pacific
Water cascading off Rob Roy Glacier, Mount Aspiring National Park, Otago, South Island, New Zealand, Pacific
Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke reflected in rice field, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia
Taal volcano, crater lake, Lake Taal, Luzon, Philippines, Southeast Asia, Asia
Taal Volcano, Lake Taal, Talisay, Luzon, Philippines, Southeast Asia, Asia
Iceberg, Pleneau Island, Antarctic Peninsula, Antarctica, Polar Regions
Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia
Waterfall beneath Mount Mayon, 2462m, a volcanic cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia
Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America
Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Lewisian gneiss, one of the oldest rocks on earth formed 2 billion years ago, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe
Duncansby Head sea stacks, north-east tip of Scotland, Caithness, Highland region, Scotland, United Kingdom, Europe
Sea stacks at Duncansby Head, near John O'Groats, north-west tip of Scotland, Caithness, Scotland, United Kingdom, Europe
Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
The Quiraing escarpment (The Table) ( The Prison), overlooking the Sound of Raasay, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Landscape typical of the region, with cypress trees and spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Rock formation called The Finger of Allah, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Scree slope and limestone vale, near Conistone, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Limestone pavement at Lea Green, Grassington, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
The flat expanse of the Grand Barra Depression, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The White Desert, Farafra Oasis, Egypt, North Africa, Africa
Perce Rock, Gaspe peninsula, province of Quebec, Canada, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, with the Olgas in the distance, Northern Territory, Australia, Pacific
Earthquake fault line in roadcut, Interstate 40, Kingman, Arizona, United States of America, North America
A man gazing up at Wave Rock, at Hyden, Western Australia, Australia, Pacific
Archaeological site of Qumran where Dead Sea scrolls discovered in caves in cliffs, Judean Desert, Israel, Middle East
Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Iguassu Falls, UNESCO World Heritage Site, Misiones region, Argentina, South America
The Pinnacles, Nambung National Park, Cervantes, Western Australia, Australia, Pacific
Trees in fall colours below snow covered Maroon Bell Mountains, at Aspen, Colorado, United States of America, North America
The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Jostedalsbreen Glacier, Fjaerland, Norway, Scandinavia, Europe