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Olduvai Gorge, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa
Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia
Cathedral Cove, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Rock arches, Beirut, Lebanon, Mediterranean Sea, Middle East
Rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Bedouin tent and rocks of the desert, Wadi Rum, Jordan, Middle East
Stratified rock at Agio Pavlos in southern Crete, island of Crete, Greece, Mediterranean, Europe
Arbol de Piedra, wind eroded rock near Laguna Colorada, Southwest Highlands, Bolivia, South America
Sof Omar cave, exit into the downstream gorge, Southern Highlands, Ethiopia, Africa
Sof Omar cave, main gallery of River Web, Southern Highlands, Ethiopia, Africa
Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa
Afzgar Arch, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Rock formation called 'the finger of Allah', Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Tourist and locals at the Magenta cliffs near Shahr-e-Zohak (Red City), between Kabul and Bamiyan (the southern route), Bamiyan province, Afghanistan, Asia
Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Rough Tor Rocks, Bodmin Moor, near Camelford, Cornwall, England, 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
View of the Pitons volcanic mountains, with bougainvillea flowers in foreground, St. Lucia, Windward Islands, West Indies, Caribbean, Central America
Yahyas Old Summer Palace, Dar Al Hajjar, Wadi Dhar, Yemen, Middle East
Sunrise with fishing boats at Land's End, Cabo San Lucas, Baja California Sur, Gulf of California, Mexico, North America
Ao Maya, Phi Phi Le, Ko Phi Phi, Krabi province, Thailand, Southeast Asia, Asia
Ao Maya, Phi Phi Le, Ko Phi Phi, Krabi province, Thailand, Southeast Asia, Asia
Tourists climbing at Wadi Rum, Jordan, Middle East
Town and castle ruins, Ortahisar, near Urgup, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Sun's rays, natural rock arch, desert scenery, Wadi Rum, Jordan, Middle East
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
View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia
View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, 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
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, 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
Miniloc Island, Big Lagoon, limestone rock formations and white sand beach, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia
Sea stacks at Duncansby Head, near John O'Groats, north-west tip of Scotland, Caithness, Scotland, United Kingdom, Europe
The Old Man of Storr, overlooking Loch Leathan and Raasay Sound, 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
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
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
A man gazing up at Wave Rock, at Hyden, Western Australia, Australia, Pacific
Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Stone Forest, near Kunming, Yunnan, China, Asia
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
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Gully erosion, Kauai, Hawaii, United States of America, Pacific, North America
Rift where earth is splitting at plate boundary, Grotagja, Lake Myvatn region, north east area, Iceland, Polar Regions
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
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 beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
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
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
La Cueva rock shelter is an archeological site occupied from almost 5,000 BC, Dripping Springs Trail, Las Cruces, New Mexico, United States of America, North America
Sung Sot Cave, UNESCO World Heritage Site, Halong bay, Vietnam, Indochina, Southeast Asia, Asia
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
Vegetation grows roots in cracks of Mereenie sandstone at King's Canyon, Red Centre, Australia
Cracked Mereenie sandstone at King's Canyon, Northern Territory, Australia
Tourists visit King's Canyon, Northern Territory, Australia
Tourists on the rim of King's Canyon, Red Centre, Northern Territory, Australia
Ripple marks preserved in the Mereenie sandstone at King's Canyon, Northern Territory, Australia
King's Canyon, Northern Territory, Australia
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
Aguerd Oudad, Tafraoute, Anti Atlas, Morocco, North Africa, Africa
Aguerd Oudad, Tafraoute, Anti Atlas, Morocco, North Africa, Africa
Dramatic autumn light on the Old Man of Storr, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Winter Sunset at Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
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
View from cliff tops down into Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Ao Maya, Phi Phi Le, Ko Phi Phi, Krabi province, Thailand, Southeast Asia, Asia
In the red tsingy area, close to Diego Suarez bay, Northern Madagascar, Africa
Mud bath, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Gutman's Cave on the Gauja River bank in the National Park of Sigulda, Vidzeme Region, Latvia, Baltic region, Europe
People swimming in limestone sinkhole pool, Cenote Ik kil, Piste, Yucatan, Mexico, North America
Isolated chalk towers, remnants of karst, Farafra Oasis, White Desert, Western Desert, Egypt, North Africa, Africa
Ayers Rock (Uluru), Northern Territory, Australia, Pacific
Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe
Miniloc Island, swimming in Big Lagoon, limestone rock formations, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia
Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe
Tourists on the rim of King's Canyon, Red Centre, Northern Territory, Australia
Rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
White Cloud Scenic Area, Mount Huangshan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
Perce Rock, Gaspe peninsula, province of Quebec, Canada, North America
Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa
Archway Cave, segment of very large lava cave, Undara Lava Tubes National Park, Queensland, Australia, Pacific
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe