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Umm El Ma lake, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
Umm El Ma lake, Erg Awbari, 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
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 Goat Fell Range, The Big Mountains of Arran, Isle of Arran, Strathclyde, Scotland, United Kingdom, Europe
A man gazing up at Wave Rock, at Hyden, Western Australia, Australia, Pacific
Alpine flowers before Mount Cook, Canterbury, South Island, New Zealand, Pacific
Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Rocky plain and hills in the background in the Negev Desert, Israel, Middle East
Trees in fall colours below snow covered Maroon Bell Mountains, at Aspen, Colorado, United States of America, North America
Mount Ararat, Anatolia, Turkey, Asia Minor, Eurasia
Stone Forest, near Kunming, Yunnan, China, Asia
Mountain stream beside Going to the Sun road, near Logan Pass, Glacier National Park, Montana, United States of America, North America
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
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Little Hura on left and Big Hura on right, Male Atoll, Maldive Islands, Indian Ocean, Asia
Little Sahara, Kangaroo Island, South Australia, Australia, Pacific
The Reichenbach Falls, where Sherlock Holmes met his death, Meiringen, Bern, Switzerland, Europe
Plane flying over sand river or lugga which may only flow with water a few days each year, Matthews Range, Kenya, East Africa, Africa
Meandering river, Irian Jaya, Indonesia, Southeast Asia, Asia
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
Solidified lava flows, El Misti volcano, 5821m, Arequipa, Peru, South America
Little Langdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
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
Sand dunes, Death Valley National Monument, California, United States of America, North America
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia
Iao Needle, also known as the Phallic stone of Kanaloa, Maui, Hawaii, United States of America, Pacific
The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
The Wakhan Valley, The Pamirs, Tajikistan, Central Asia, Asia
High Force Waterfall, 70 feet (21 m) high, Upper Teesdale, County Durham, England, United Kingdom, Europe
Desert safari, Dubai, United Arab Emirates, Middle East
Sand dunes of Maspalomas, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Sung Sot Cave, UNESCO World Heritage Site, Halong bay, Vietnam, Indochina, Southeast Asia, Asia
A girl sits in a hot river, Hveragerdi, Iceland, Polar Regions
Arenal volcano, La Fortuna, Costa Rica, Central America
Sandy dunes at Sotovento beach, Jandia Peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Arenal volcano, La Fortuna, Costa Rica, Central America
A large stretch of burnt fairy circles in NamibRand, Namib Desert, Namibia, Africa
Brooding clouds over the vivid red dunes of NamibRand, Namib Desert, Namibia, Africa
Twilight at the dunes and beach at Holkham Bay, Norfolk, England, United Kingdom, Europe
Twilight at the dunes and beach at Holkham Bay, Norfolk, England, United Kingdom, 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
Ama Dablam 6812m, Solu Khumbu Everest Region, Sagarmatha National Park, Himalayas, Nepal, Asia
Airplane flying over Bahamas sand banks, West Indies, Central America
Vineyards in the Shabo winery, Black Sea, Ukraine, Europe
Part of Stock Ghyll Force waterfall near Ambleside, Lake District National Park, Cumbria, England, United Kingdom, Europe
Meteor crater, the largest known in the world, Arizona, United States of America, North America
Dramatic autumn light on the Old Man of Storr, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Chesil Beach and The Fleet Lagoon, Weymouth, Dorset, England, United Kingdom, Europe
Lake Atitlan from Lomas de Tzununa Hotel with San Pedro Volcano in the background, Guatemala, Central America
Jokulgilskvisl valley and slopes of Kylingaskard and Nordurbarmur mountains, Landmannalaugar area, Fjallabak region, Iceland, Polar Regions
Jokulkvisl River and valley at the foot of Kerlingarfjoll Mountains, a majestic massif of rhyolitic domes, Iceland, Polar Regions
Dyrholaey inselberg and cliffs, southernmost point of Iceland, from the low-lying coast near Vik, Iceland, Polar Regions
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
Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), 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
Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa
Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa
Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa
A hiker on Poon Hill looks towards Dhaulagiri Himal, Annapurna Conservation Area, Dhawalagiri (Dhaulagiri), Western Region, Nepal, Asia
Crater lake of Volcan Santa Ana, 2365m, Parque Nacional Los Volcanes, El Salvador, Central America
Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa
Harrison's Cave, Barbados, Windward Islands, West Indies, Caribbean, Central America
Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.
Huliba limestone caves, Arikok National Park, Aruba (Dutch Antilles), West Indies, Caribbean, Central America
Hato Caves, limestone caves open to visitors on the north coast of Curacao (Dutch Antilles), West Indies, Caribbean, Central America
Devil's Marbles, the result of spheroidal weathering of strong granite beneath an ancient soil, Tennant Creek, Northern Territory, Australia, Pacific
Rio Aragon Subordan and upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe
Rio Cares carving through karst limestone valley in the Picos de Europa mountains, near Panes, Asturias, Spain, Europe
View from cliff tops down into Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Red Arrows, Royal Air Force aerobatic display team, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
The Redwall Cavern, a giant cave in the walls of the Grand Canyon, seen while rafting down the Colorado River, Grand Canyon, Arizona, United States of America, North America
Hound Tor, Dartmoor National Park, Devon, England, United Kingdom, 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
Green Bridge of Wales, Pembrokeshire, Wales, United Kingdom, Europe
Green Bridge of Wales, Pembrokeshire, Wales, United Kingdom, Europe
Canadian Pacific train at Morant's Curve in winter along the Bow River, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
High Force in Upper Teesdale, County Durham, England, United Kingdom, Europe
Storm clouds move in over the reedbeds towards Cley Windmill at Cley Next the Sea, Norfolk, England, United Kingdom, Europe
Asir province, Saudi Arabia, Middle East