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A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Sandstone cliffs of Belle-Anse, Cap aux Meules island, Magdalen Islands, Gulf of Saint Lawrence, Quebec province, Canada, North America

Natural rock formations at Zabriskie Point, Death Valley National Park, Eastern California, California, United States of America, North America

Folded sedimentary rocks in cliffs at Welcombe Mouth, on the Atlantic coast; Hartland, north Devon, England, United Kingdom, Europe

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

East slopes of Haystack Mesa 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.

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 lone hoodoo rock on the edge of a ridge overlooking the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Natural arch, Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Dramatic canyon terrain at Grand View Point at dusk, Canyonlands National Park, Utah, United States of America, North America

Golden evening light on the limestone cliffs, Dunraven Bay, Southerndown, Vale of Glamorgan, Wales, United Kingdom

Looking down on the deep blue Katsura River, in the autumnal forests in Arashiyama of Kyoto, Honshu, Japan, Asia

Natural stone arch eroded by wind known as Arco de las Penitas, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Natural arch, Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

A rock spire sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

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

Crumbling islands of rock near Hamilili Point in Petrified Forest, Arizona, United States of America, North America

Typical eroded limestone outcrops and lake in karst region, Rammang-Rammang, Maros, South Sulawesi, Indonesia, Southeast Asia, Asia

Hoodoo spires rising above the valley below the south side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Typical eroded limestone outcrops and lake in karst region, Rammang-Rammang, Maros, South Sulawesi, Indonesia, Southeast Asia, Asia

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

Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Owachomo Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Owachomo Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

The Pont d'Arc, a natural rock arch over the Ardeche River, in the Ardeche Gorges, in the Ardeche region of the Rhone Alpes, France, Europe

Gaada Stack natural arch, 45 m high, at sunset, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Natural rock archway carved by the sea through limestone rock at Cuevas del Mar (sea caves) beach, near Llanes, Asturias, Spain, Europe

Gaada Stack natural arch, 45 m high, at sunset, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Bow Fiddle Arch, spectacular natural arch near Portknockie, Morayshire, Scotland, United Kingdom, Europe

Gaada Stack, a natural arch 45 m high, old red sandstone, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Dyrholaey natural arch, the southernmost point in Iceland, near Vik, in the south of Iceland (Sudurland), Iceland, Polar Regions

Natural arch on edge of Threehole Bay, Kenai Fjords, Aialik Peninsula, Alaska, United States of America, North America

Weathered sandstone rocks and natural archway at Ponta da Piedade at low tide, Lagos, Algarve, Portugal, Europe

Shags and Gaada Stack, a natural arch 45 m high, old red sandstone, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Mobius arch, natural arch formed out of granite rock at sunrise, lone pine peak, 12994, feet, alabama hills, sierra nevada, lone pine, california, usa

Mobius arch, natural arch formed out of granit rock at sunrise, lone pine peak, 12994, feet, mt. whitney, 14497, feet, highest peak of lower 48, alabama hills, sierra nevada, lone pine, california, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Natural limestone reef formations with beach in the background, Muro Alto, Pernambuco, Brazil, South America

Pia bay or Pia Fjord, in Beagle Channel (northwest branch), PN Alberto de Agostini, Tierra del Fuego, Patagonia, Chile

Pia Glacier, from Pia bay, in Beagle Channel (northwest branch), PN Alberto de Agostini, Tierra del Fuego, Patagonia, Chile

Pia Glacier, from Pia bay, in Beagle Channel (northwest branch), PN Alberto de Agostini, Tierra del Fuego, Patagonia, Chile

Mirador Cuernos, in Lago Nordenskjöld, You can see the amazing Cuernos Del Paine and Monte Almirante Nieto, Torres del Paine national park, Patagonia, Chile

Detail of Cordillera Darwin, from Beagle Channel (northwest branch), PN Alberto de Agostini, Tierra del Fuego, Patagonia, Chile

Natural swimmingpool in Isalo National Park near Ranohira, Ihorombe region, South Madagascar, Africa

Photographer Norbert Eisele-Hein at Spectra Point, Cedar Breaks National Monument, Dixie National Forest, Brian Head, Utah, USA

Rock formations in El Ghessour, Tassili du Hoggar, Wilaya Tamanrasset, Sahara Desert, Algeria, North Africa

Rock window, rock formations at Youf Ahakit, Tassili du Hoggar, Wilaya Tamanrasset, Sahara Desert, Algeria, North Africa