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Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America
Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America
Sandy dunes near Lagoa Bonita (Beautiful lagoon) at Parque Nacional dos Lencois Maranhenses, Brazil, South America
Fumaroles on the crater edge, island of Vulcano, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
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
View east along crater rim from Orongo ceremonial village of the Rano Kau crater, Easter Island, Chile, Pacific, South America
Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe
Bamiyan (Bamian) Valley and Koh-i-Baba (Kuh-e-Baba) mountain range, Afghanistan, Asia
St. Margaret's at Cliffe, White Cliffs of Dover, Kent, England, United Kingdom, Europe
The Cairngorms near Aviemore, Highland region, Scotland, United Kingdom, Europe
Rough Tor Rocks, Bodmin Moor, near Camelford, Cornwall, England, United Kingdom, Europe
The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America
The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America
One of the crater lakes at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia
Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia
Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia
Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia
Scenery between Herat and Maimana, Afghanistan, Asia
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
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
The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Mont Blanc range near Chamonix, Haute-Savoie, French Alps, France, Europe
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
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
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
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
Lagoa Azul (Blue Lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South 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
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
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
Water cascading off Rob Roy Glacier, Mount Aspiring National Park, Otago, South Island, New Zealand, Pacific
Taal volcano, crater lake, Lake Taal, Luzon, Philippines, Southeast Asia, Asia
Mount Mayon, 2462 m, near-perfect volcano 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
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
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
Landscape typical of the region, with cypress trees and spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Akakus, Sahara desert, Fezzan, Libya, North Africa, 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 desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
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
Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America
Detail, The Coloured Canyon, near Nuweiba, Sinai, Egypt, North Africa, Africa
Oldonyo Lengai volcano, 2878m, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Sand patterns in water, dark volcanic sand lying just below white sand, Manuel Antonio National Park, Quepos, Costa Rica, Central America
The beach and multi-coloured cliffs at Alum Bay, accessible by chairlift, Isle of Wight, Hampshire, England, United Kingdom, Europe
Example of folding in rocks, Millook Beach, Cornwall, England, United Kingdom, Europe
Gully erosion, Kauai, Hawaii, United States of America, Pacific, North America
Flood waters in Algerian Sahara, at edge of Grand Erg Occidental, south of El-Golea, Algeria, North Africa, Africa
Rift where earth is splitting at plate boundary, Grotagja, Lake Myvatn region, north east area, Iceland, Polar Regions
Solidified lava flows, El Misti volcano, 5821m, Arequipa, Peru, South America
Gordale Scar, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Limestone pavement, Malham, Yorkshire Dales National Park, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
The Remarkable Rocks, weathered layer remnants on a granite dome, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Columnar structures, created during cooling of basalt lava, with an intrusion or dyke of darker rock in the foreground, near Bombo Beach, Kiama, south coast, New South Wales, Australia, Pacific
Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
The Wakhan Valley, The Pamirs, Tajikistan, Central Asia, Asia
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
High Force Waterfall, 70 feet (21 m) high, Upper Teesdale, County Durham, England, United Kingdom, Europe
Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America
Sand dunes of Maspalomas, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Sandy dunes at Sotovento beach, Jandia Peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, 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
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Limestone formations and waterfall at Buttertubs on the Pass from Wensleydale to Swaldale, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe
Limestone formations at Buttertubs on the Pass from Wensleydale to Swaldale, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe
Meteor crater, the largest known in the world, Arizona, United States of America, North America
Chesil Beach and The Fleet Lagoon, Weymouth, Dorset, England, United Kingdom, Europe
Mount Krakatindur, 858 m, standing solitary in the Nyjahraun lava field, east of Hekla volcano in the distance, Fjallabak route north (Nyrdri-Fjallaback) in the interior, Iceland, Polar Regions
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Hikers exploring the active hot spring area at Kerlingarfjoll, Iceland, Polar Regions
Hikers taking a rest above the Skaftafellsjokull glacier, Skaftafellsa glacial river in the background, in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
Winter Sunset at Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe