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Frank Slide, where giant rockfall occurred in 1903, limestone debris fell 400m, Alberta, Canada, North America

Sunset, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Punting boats on delta river, limestone mountain scenery, Van Long, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Punting boats on delta river, limestone mountain scenery, Van Long, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Bicycle in the morning mist at sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Boat on river, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Hanging coffins of Animistic Applai elders entombed on limestone cliffs, Sagada Town, The Cordillera Mountains, Benguet Province, Luzon, Philippines, Southeast Asia, Asia

Bicycles in the morning mist at sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Rio Aragon Subordan and upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe

Rio Cares carving through karst limestone valley in the Picos de Europa mountains, near Panes, Asturias, Spain, 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

Tourist boat from Guilin Tourism Co. Ltd carries Chinese tourists along Li River between Guilin and Yangshuo, China

Boats at sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe

Boat on river, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Hanging coffins of Animistic Applai elders entombed on limestone cliffs, Sagada Town, The Cordillera Mountains, Benguet Province, Luzon, Philippines, Southeast Asia, Asia

Morning mist, sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Ridges of jagged limestone peaks over 2000m high in the Valdeon area, near the Cares Gorge, in the Picos de Europa mountains in Cantabria, Spain, Europe

Bridge over Rio Aragon Subordan in the upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe

Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe

Walkers on a narrow mountain road above the Cares Gorge, 1000m deep, 12km limestone gorge, in the Picos de Europa mountains in Cantabria, Spain, Europe

Viewpoint with people admiring view and the limestone Sierra Hidalga in distance, Sierra de las Nieves Natural Park, El Burgo, Malaga, Andalucia (Andalusia), Spain, Europe

Encroaching forest in limestone basin, Phontiou tin mine, plain of mine tailings and pollution, Khammouan, Laos, Indochina, Southeast Asia, Asia

Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe

Morning mist, sunrise, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Frank Slide (massive rockslide of limestone from Turtle Mountain that buried town in 1903), Crowsnest Pass, southern Alberta, Rockies, Canada, North America

Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe

Punting boats on delta river, limestone mountain scenery, Van Long, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia

Limestone escarpments above Escuain gorge with snow covered high Pyrenees peaks in the background, Huesca, Aragon, Spain, Europe

Inclined bedding planes in limestone on peaks above Johnsons Canyon, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Adiabatic clouds forming on the 1900m high karst limestone Bohinj Ridge Mountains in the Julian Alps, as rising air cools, with grasses and Dwarf pines (Pinus mugo) growing between areas of exposed rock, Triglav National Park, Slovenia.

Overview of Vinjerac fishing village and harbour with the karst limestone Velebit mountain range of the Dinaric Alps in the background, Zadar province, Croatia.

Overturned beech tree on limestone rocks of the deep mountain stream Suha in the Triglav National Park, Gorenjska, Slovenia

Suha mountain stream meanders through the limestone rocks in primeval beech forests of the Triglav National Park, Gorenjska, Slovenia

Spire of parish church Maria Himmelfahrt in front of the Zugspitze (2962 m), Garmisch-Partenkirchen, Upper Bavaria, Germany

View at the town Sisteron between the river Durance and high limestone cliffs, Alpes-de-Haute-Provence, Provence, France

Schloss Trautenfels Castle, Ennstal valley, Upper Styria, Styria, Austria, Europe, PublicGround, Europe

Aescher tavern and panorama mountain view in the steep facing north flank of Ebenalp mountain, Appenzell, Switzerland

Couple photographing, making a selfie in front of mountain scenery, Patscherkofel, Patsch, Inntal chain, Innsbruck, Tyrol, Austria, Europe

Chinese fisherman with a straw hat on a bamboo raft fishing near Yangshuo in the Yulong River in front of limestone cliffs, Yangshuo, Guilin, Guanxi, China