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Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, 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

Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

The Burren famous glaciated karst pavement landscape of limestone and dry stone walls, County Clare, West of Ireland

Limestone pavement glaciated karst landscape and native flora in The Burren, County Clare, West of Ireland

Wild native flower flora and limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland

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

150 million year old fossilised footprint (ichnite) of theropod dinosaur in karst limestone rock, Terenes, Asturias, Spain, Europe

Isolated chalk towers, remnants of karst, Farafra Oasis, White Desert, Western Desert, Egypt, North Africa, Africa

Poulnabrone Dolmen megalythic burial tomb in The Burren glaciated karst landscape pavement, County Clare, Ireland

Castro de Gaviotas (Gull's fort) karst limestone rock archway, and La Canalina bay, near Llanes, Asturias, Spain, Europe

A variety of speleothems including stalactites, stalagmites, columns, straws and drapery at Ngilgi Cave, a limestone Karst cave system near Yallingup in the South West, Augusta-Margaret River Shire, Western Australia, Australia, Pacific

Buelna beach and karst limestone El Picon rock pillar at high tide on a windy day, near Llanes, Asturias, Spain, Europe

Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe

Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe

Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe

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

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

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

Limestone Mogotes, Vinales Valley, UNESCO World Heritage Site, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

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

A swamp gum, the world's tallest flowering plant, Marakoopa, Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Karst limestone rocks, Halong Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Ladder leading down into a channel between the limestone karsts of the Grand Tsingy in Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View of suspension bride spanning the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

View of suspension bride spanning the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

Fish-eye lens view across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

Stalactites, stalagmites and rimstone at Marakoopa Cave in Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

View of the tourist hiking trail through the limestone karsts of the Grand Tsingy in Tsingy De Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

The Tsingy Rary landscape of limestone karsts in Ankarana National Park in northern Madagascar, Madagascar, Africa

Karst limestone rocks and house boats, Halong Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

A man climbing down into a channel between the limestone karsts of the Grand Tsingy in Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

The Tsingy Rary landscape of limestone karsts in Ankarana National Park in northern Madagascar, Madagascar, Africa

Stalactites at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

The Tsingy Rary landscape of limestone karsts in Ankarana National Park in northern Madagascar, Madagascar, Africa

Stalactites, stalagmites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Karst limestone rocks and house boats, Halong Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Stalactites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Stalactites, stalagmites and columns at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Karst limestone rocks, tour boats and house boats, Halong Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Thrift (Armeria maritima), Rock sea lavender (Limonium binervosum) and Coastal ragwort (Senecio leucanthemifolius) flowering on karst limestone sea cliffs at Pria, near Ribadesella, Asturias, Spain.

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

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.

El Tornillo rock formation. El Torcal de Antequera, Sierra del Torcal, Antequera, M�laga, Andalusia, Spain. Karstic rock formations

Snorkeling trip to Pileh, a beautiful scenic lagoon, Ko Phi-Phi Leh, Ko Phi-Phi Islands, Krabi, Thailand

View over Maya Bay, a beautiful scenic lagoon, famous for the Hollywood film "The Beach" with anchored boats, Ko Phi-Phi Leh, Ko Phi-Phi Islands, Krabi, Thailand, after the tsunami

Boats anchoring in the Maya Bay, a beautiful scenic lagoon, famous for the Hollywood film "The Beach", Ko Phi-Phi Leh, Ko Phi-Phi Islands, Krabi, Thailand, after the tsunami

Boatman standing on a long tail boat and holding a rope, Maya Bay, a beautiful scenic lagoon, famous for the Hollywood film "The Beach", Ko Phi-Phi Leh, Ko Phi-Phi Islands, Krabi, Thailand, after the tsunami

View over Maya Bay, a beautiful scenic lagoon, famous for the Hollywood film "The Beach" with anchored boats, Ko Phi-Phi Leh, Ko Phi-Phi Islands, Krabi, Thailand, after the tsunami

Water buffalo pulling cart with hay and farmer, karst formations in the background, Shilin, Yunnan, People's Republic of China, Asia

Guide watches as woman crosses rope bridge, karst landscape in Tsingy de Bemaraha National Park, Madagascar, Mahajanga Province, Africa, UNESCO World Heritage Site

Bufones de las Arenillas, Geyser by breaker, karst, tides, sea, Atlantic ocean, near Llanes, Camino de la Costa, Coastal route, Camino del Norte, Way of Saint James, Camino de Santiago, pilgrims way, province of Asturias, Principality of Asturias, Northern Spain, Spain, Europe

sharp-edged karst landscape, Tsingy de Bemaraha National Park, Madagascar, Mahajanga Province, Africa, UNESCO World Heritage Site

Woman anxiously crossing rope bridge, karst landscape in Tsingy de Bemaraha National Park, Madagascar, Mahajanga Province, Africa, UNESCO World Heritage Site

View from the Kyauk Ka Lat Pagoda on a rock, golden stupa in front of karst mountains, Kayin State, Myanmar, Birma, Asia

Madagasse in the karst landscape of Tsingy de Bemaraha, Tsingy-de-Bemaraha National Park, Mahajanga, Madagascar, Africa

Karst cliffs and rice fields in the evening sun are reflected at harvest time in the Yulong River in the rocky karst landscape near Yangshuo, Guilin, Guangxi, China, Asia

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

Junk in the sea of Halong Bay, a UNESCO World Natural Heritage Site, Karst mountains, romantic sunset, image composition, Vietnam, Asia

Riesenburg cave, natural karst cave ruin of Frankendolomite, geotope, natural monument, in the back climber at rock face, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

Fish farming pond near Yangshuo at Yulong River in front of trees and karst rocks, Yangshuo, Guilin, Guanxi, China, Asia

Hikers on the Heilbronn circular hiking trail in front of the Dachstein shark sculpture, behind it the Hoher Dachstein, Karst hiking trail, Krippenstein, Dachstein massif, Salzkammergut, Upper Austria, Austria, Europe

Chamois (Rupicapra rupicapra) and mountain landscape above clouds at Rosskofel, called Monte Cavallo di Pontebba, is located in the west of the ski area Nassfeld and is a karst mountain, Austria, Europe

Versturzhoehle Riesenburg, natural karst cave ruin of Frankendolomite, geotope, natural monument, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe