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Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, Arizona, United States of America

The 17th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Valley next to Rainbow Mountain, Uchullujllo, Pitumarca District, Canchis Province, Cuzco Region, Peru, South America

Examples of Tafoni created in the Warton Sandstone layer, King George River, Kimberley, Western Australia, Australia, Pacific

Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Cliff view of Dead Wash Valley in Petrified Forest National Park, at sundown, Arizona, United States of America

Desert Spiny Lizard (Sceloporus magister) in Sand Hollow State Park near St. George, Utah, United States of America

The Seven Sisters chalk cliffs from Birling Gap, South Downs National Park, East Sussex, England, United Kingdom

Limestone cliffs and beach, Dunraven Bay, Southerndown, Vale of Glamorgan, South Wales, United Kingdom

A view from High Cliff to the Neck, on the east coast of Skomer Island, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Jabal Ikmah Site, world's largest concentration of well-preserved Dadanitic inscriptions, 1st millennium BCE, AlUla, Medina Province, Saudi Arabia

Woman walking with headlamp at the bottom of canyon with sandstone walls in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Road through the sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Cape Tainaron (Cape Matapan) landscape, the southernmost point of Greece, Mani Peninsula, Peloponnese, Greece

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

Drone aerial view of Meteora with ancient holy Monastery of Varlaam and Great Meteoron, UNESCO, Kalabaka, Greece

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Safari tour among the magnificent sandstone rock structures in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Safari tour among the magnificent sandstone rock structures in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Sandstone rock tower beside a large dry salt lake in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Aerial view of Jabal Ithlib area within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

Aerial view of Qasr al-Farid, the largest tomb within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

Entrance of the passage through the Siq channel at Jabal Ithlib area of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Passage through the Siq channel at Jabal Ithlib area within the Site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Passage through the Siq channel at Jabal Ithlib area within the Site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Tombs carved into sandstone rock of Jabal Banat (Qasr Al-Bint) area in site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Woman in front of Face Rock, a sandstone rock formation in shape of human head profile, Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Jabal Alfil (Elephant Rock) by night, a natural red sandstone formation in the area of AlUla, Medina Province, Saudi Arabia

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Loop Drive, Three Sisters on left, Camel Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

North Window, Elephant Butte on left, Cly Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

Early Morning Sunrise, West Mitten Butte, Monument Valley Navajo Tribal Park, Utah, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

A view of Krossfjorden (Cross Fjord) on the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Norway

Bikers on the unpaved road going up from Anmiter to the village of Tighza, Ouarzazate Province, region of Draa-Tafilalet, Morocco

A dry waterfall in Crystal Creek below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.