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Isolated tree among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Distant view of layered mountain ranges of Sierra Nevda and Sierras de Tejeda, Almijara y Alhama align, with a prominent peak, Andalusia, Spain

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, 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

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

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

People meeting in front of magnificent sandstone rock structure in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

Man squatting beside extraordinary sandstone rock structure called Dancing Rocks, 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

Aerial view from helicopter, of a farm in an ancient oasis in the desert with canyons of the Ashar Valley,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

Tombs carved into sandstone rock of Jabal Banat (Qasr Al-Bint) area in 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 at Tomb of Lihyan, son of Kuza (Qasr al-Farid), carved into sandstone outcrop in Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Towering Limestone Stacks of Pancake Rocks Surrounded by Crashing Waves at Punakaiki, West Coast, New Zealand

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

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 the tidewater glacier in Isbukta (Ice Bay) on the western side of Spitsbergen Island, Svalbard Archipelago, Norway

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

Lodore Waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Shoreline view of the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

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

Geological Devil's Bridge, a natural arch carved by the sea from soft and hard limestone ledges of the Antigua formation, Antigua, Leeward Islands, West Indies, Caribbean, Central 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.

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.

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.

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.

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

View of calm seas and reflected mountains surrounding Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions

Icebergs near the Antarctic Peninsula during the summer months, Antarctica, Southern Ocean, Polar Regions

View of calm seas and reflected mountains surrounding Damoy Point in Dorian Bay, Antarctica, Polar Regions

Towering red rock formations in the Warton Sandstone, King George River, Kimberley, Western Australia, Australia, Pacific

Views of the Vasilievbreen (Vasiliev Glacier), in Isbukta (Ice Bay) near the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Bend of Colorado River at Dead Horse Point, Dead Horse Point State Park, Utah, United States of America, North America

Grand Canyon, Navajo Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, from Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

Two people walking at the bottom of a canyon with sandstone walls in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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