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Eastern shore of the Dead Sea, with salt concentration of over 20% sodium chloride (also rich in magnesium, calcium and potassium chlorides, Jordan
Farmland and rock formations of Guangxi, Guilin Province, China
Giant's Causeway, County Antrim, Northern Ireland, UK, Europe
Giant's Causeway, County Antrim, Northern Ireland, UK, Europe
The Giant's Causeway, Co Antrim, Northern Ireland
The Giant's Causeway, Co Antrim, Northern Ireland
Pinnacles and rock formations caused by erosion, in the Bryce Canyon National Park, in Utah, USA
Coloured rock in waves formation in Upper Antelope Canyon, Slot Canyon, Page, Arizona, USA
Rock formation, Punakaiki, Paparoa National Park, West Coast, South Island, New Zealand, Pacific
To Sua ocean trench in Upolu, Samoa, South Pacific, Pacific
The rocky coast around Ha'ateiho, Tongatapu, Tonga, South Pacific, Pacific
Ha'ateiho, big rock arch in Tongatapu, Tonga, South Pacific, Pacific
Last light on the Fitz Roy Mountain Range, Laguna Capri, Los Glaciares National Park, UNESCO World Heritage Site, Santa Cruz Province, Argentina, South America
Last light on the Fitz Roy Mountain Range, Laguna Capri, Los Glaciares National Park, UNESCO World Heritage Site, Santa Cruz Province, Argentina, South America
Sunrise over the Fitz Roy Mountain Range, Laguna Capri, Los Glaciares National Park, UNESCO World Heritage Site, Santa Cruz Province, Argentina, South America
A Waterpocket Fold highlighting the erosion of tilted rock layers, formed 50 to 70 million years ago, Capitol Reef National Park, Utah, United States of America, North America
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Sandstone hills and termite mounds in The Domes area of Purnululu National Park (Bungle Bungle), UNESCO World Heritage Site, Western Australia, Australia, Pacific
Sandstone hills and termite mounds in The Domes area of Purnululu National Park (Bungle Bungle), UNESCO World Heritage Site, Western Australia, Australia, Pacific
Hooker Lake and Glacier with icebergs and Mount Cook, Mount Cook National Park, UNESCO World Heritage Site, Canterbury region, South Island, New Zealand, Pacific
Tourists hiking on the Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific
Tourists hiking up to the Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific
Huge waterfall on the bottom of Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific
Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA
Snow clearing equipment at a tunnel through sunlit red rock in winter, Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America
Ash, rock and sulphur at the smoking summit of 3350m high volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Delicate Arch at dusk, Arches National Park, Utah, United States of America, North America
The Fire Wave, Valley of Fire State Park, Nevada, United States of America, North America
Mesa Arch at dawn, Canyonlands National Park, Utah, United States of America, North America
View of Courthouse Towers, The Organ and Three Gossips at dawn, Arches National Park, Utah, United States of America, North America
The Mittens and Merrick Butte, Monument Valley Navajo Tribal Park, Utah, United States of America, North America
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Bodmin Moor, Cornwall, England, United Kingdom, Europe
Tourists ascending Sigiriya (Lion Rock), UNESCO World Heritage Site, Sri Lanka, Asia
Coastal landscape, Cabo de Gata natural park, looking east towards San Jose, Almeria, Andalusia, Spain, Europe
Rock and Spindle on the Fife Coast near St, Andrews, Fife, Scotland, United Kingdom, Europe
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Visitor at Painted Wall View Point, Gunnison River deep in the canyon, Black Canyon of the Gunnison National Park, Colorado, United States of America, North America
Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Hot air balloon over the phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Freshwater Bay and Tennyson Down from Afton Down, Isle of Wight, England, United Kingdom, Europe
The Wain Stones (Kissing Stones) on Bleaklow Moor, on the Pennine Way footpath, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Old Goris, Goris, Armenia, Central Asia, Asia
Preseli Hills (Mynyddoedd Y Preseli), source of Stonehenge bluestone megaliths, Pembrokeshire, Wales, United Kingdom, Europe
Limestone pinnacles in Shilin, Stone Forest, at Lunan, Yunnan, China, Asia
Natural arch, Spitskoppe mountains, Damaraland, Namibia, Africa
Active lava eruption on the Tolbachik volcano, Kamchatka, Russia, Eurasia
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Gritstone rock formations amongst the heather clad moors of Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
The Old Man of Storr, a rock formation on the edge of the Trotternish Ridge, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Cliffs at Herald Island, UNESCO World Heritage Site, Chuckchi Sea, Russian Far East, Russia, Europe
Tham Khao Luang Cave, Phetchaburi, Thailand, Southeast Asia, Asia
Hoodoos, limestone features, Badlands, Drumheller area, Alberta, Canada, North America
Spectacular geological formations at Westcombe Beach in the South Hams, Devon, England, United Kingdom, Europe
A geological formation located near Twyfelfontein, Namibia, Africa
A geological formation of dolomite located near Twyfelfontein, Namibia, Africa
Ponies graze in the summer sunshine beside Chinkwell Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Summer at Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Rainbow over Dartmoor at dawn in summer, Holwell Tor, Dartmoor, Devon, England, United Kingdom, Europe
Summer morning on a rocky outcrop near Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Layered sandstone column under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America
Kaleto Rock Fortress, rock formations, Belogradchik, Bulgaria, Europe
Peace Monument, Caucasus Mountains, Border of Russia and Georgia, Central Asia, Asia
Interior, Shwe Oo Min natural Buddhist cave pagoda, Pindaya, Shan State, Myanmar (Burma), Asia
Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay
Sedimentary layers of bluish bentonite clay, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America
Raufarholsheillir lava tube cave system, Iceland, Polar Regions
Japanese warning sign on the crater rim of Mount Naka active volcano, Mount Aso, Kyushu, Japan, Asia
Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America
Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America
Puu Hinahina Lookout, Waimea Canyon State Park, Kauai, Hawaii, United States of America, Pacific
Aerial view of lagoon and karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Cenote Dzitnup, near Valladolid, Yucatan, Mexico, North America
Cenote Samula, near Valladolid, Yucatan, Mexico, North America
Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe
Cenote Zaci, Valladolid, Yucatan, Mexico, North America
Cenote Ik Kil, near Chichen Itza, Yucatan, Mexico, North America
Karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Malpais badlands volcanic landscape looking northeast from Los Hervideros, Parque Natural Los Volcanes, near Yaiza, Lanzarote, Canary islands, Spain, Atlantic, Europe
Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Woman posing in Rattlesnake Canyon, Arizona, United States of America, North America
Snow dusted Kes Tor showing Dartmoor's largest rock basin, Dartmoor National Park, Devon, England, United Kingdom, Europe
Ammonite fossils revealed in slate rock ledges at low tide, Kilve, Somerset, England, United Kingdom, Europe
Glaciar Frances, French Valley (Valle Frances), Torres del Paine National Park, Patagonia, Chile, South America
Blackchurch Rock and rocky ledges at twilight, Mouthmill Beach, North Devon, England, United Kingdom, Europe
Laguna Cejar (floating salt lake lagoon), Atacama Desert, North Chile, Chile, South America
Expansive open-pit mine with winding roads under a cloudy sky, North Yorkshire, England, United Kingdom, Europe
Hot pool on the Rainbow Terrace at Orakei Korako Geyserland, The Hidden Valley, North Island, New Zealand, Pacific
The Sol de Manana geysers, a geothermal field at a height of 5000 metres, Bolivia, South America