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Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa

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

Hiker on walkway admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Berne, Switzerland, Europe

Miniloc Island, Big Lagoon, limestone rock formations and white sand beach, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

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

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

Cheddar Gorge tourist attraction, limestone rock formations, Somerset, England, United Kingdom, Europe

Miniloc Island, big lagoon and limestone rock formations, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

Miniloc Island, catamaran for island hopping, in small lagoon with jagged limestone rock formations, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

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

Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe

Hiker on walkways admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Uri, Switzerland, Europe

Bell tower in village built on steep limestone crag, Guadalest, Costa Blanca, Valencia region, Spain, Europe

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

Cemi Rock engravings inside San Gabriel Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

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

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

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

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

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

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

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

Pre-Columbian Rock paintings inside La Linea Limestone Cave, Los Haitises National Park, Dominican Republic, West Indies, Central America

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.

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

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.

Large rocks placed on the shore of the west coast of Walney Island, to prevent coastal erosion, Cumbria, England, United Kingdom, Europe

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

Repairing the sea wall damaged and breached by storms on the coast road near Barrow in Furness, between Rampside and Baycliff, Cumbria, England, United Kingdom, Europe

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

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

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