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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
Water cascading off Rob Roy Glacier, Mount Aspiring National Park, Otago, South Island, New Zealand, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, with the Olgas in the distance, Northern Territory, Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
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
The Remarkable Rocks, weathered layer remnants on a granite dome, Flinders Chase National Park, Kangaroo Island, South 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
Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America
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
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
Huliba limestone caves, Arikok National Park, Aruba (Dutch Antilles), West Indies, Caribbean, Central America
The Olgas (Kata Tjuta) at sunrise, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Rocks along the coastline in the Acadia National Park, Maine, New England, United States of America, North America
Pinnacles and rock formations caused by erosion and known as The Silent City, seen from Inspiration Point, in the Bryce Canyon National Park, Utah, United States of America, North America
Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Limestone pavements near Chapel-le-Dale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America
Rock formations caused by erosion, and a solitary pine tree above the Queens Garden, in the Bryce Canyon National Park, in Utah, United States of America, North America
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
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
Aerial view of the Iguassu Falls, Iguassu National Park, UNESCO World Heritage Site, Parana, Brazil, South America
Hound Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
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
Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
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
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
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
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
The Pinnacles, Nambung National Park, Cervantes, 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
Part of Nourlangie Rock, sacred aboriginal shelter and rock art site, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Sand patterns in water, dark volcanic sand lying just below white sand, Manuel Antonio National Park, Quepos, Costa Rica, Central America
Mount Fuji (3776m), Owakidani geothermal park, Hakone, Honshu Island, Japan, Asia
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
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
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
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
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
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
Limestone pavement at Lea Green, Grassington, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
Llamas grazing before Volcanoes Parinacota and Pomerape, Lauca National Park, Chile, South America
Devils Punchbowl Falls, 131m high, on walking track in mountain beech forest, Arthur's Pass National Park, Southern Alps, Westland, South Island, New Zealand, Pacific
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Peyto Lake, Mount Patterson and Mistaya valley, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America
People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia
Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
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
A general view of the Athabasca Glacier, a six kilometre tongue of ice flowing from the Columbia Icefield. It is the best-known glacier in the Canadian Rockies and is situated in Jasper National Park, Alberta, Canada.
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
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
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Views from the Nadab lookout, at the sacred Aboriginal site of Ubirr, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Late winter hiker on Tongariro Crossing, Mount Ngauruhoe and South Crater, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific