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Punting boats on delta river, limestone mountain scenery, Van Long, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia
The 659m limestone Monte Cefano Nature Reserve and Custonaci marble quarries, on the coastline north east of Trapani, Custonaci, Sicily, Italy, Mediterranean, Europe
The 659m limestone Monte Cefano, Nature Reserve and hiking and climbing spot, juts into the sea northeast of Trapani, Custonaci, Sicily, Italy, Mediterranean, Europe
Frankincense trees growing wild on the limestone hillsides, Dhofar Mountains, Salalah, southern Oman, Middle East
Olive trees near village of Aldea de Guaro, limestone mountains, Periana, Axarquia, Andalusia, Spain, Europe
Typical scenery of limestone mountains and River Li at dawn, Guilin, Yangshou, Guangxi Province, China, Asia
Typical scenery of limestone mountains and River Li at dawn, Guilin, Yangshou, Guangxi Province, China, Asia
Snow capped Ingleborough from the limestone pavements on Twistleton Scar, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Snow capped Ingleborough from the limestone pavements on Twistleton Scar, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Ingleborough mountain from the limestone pavements on Twistleton Scar End, Yorkshire Dales, England, United Kingdom, Europe
Ingleborough seen from the limestone pavement on Twistleton Scar, North Yorkshire, England, United Kingdom, Europe
Limestone desert landscape, Los Molinos del Río Aguas, Paraje Natural de Karst en Yesos de Sorbas, Almeria, Andalusia, Spain, Europe
Small hamlet of Carrion, at base of limestone mountains, near Periana, Axarquía, Andalusia, Spain, Europe
Waterfalls cascade down the karst limestone cliffs of the Cirque de Gavarnie, Pyrenees National Park, Hautes-Pyrenees, France, Europe
Rock climber in action at Leonidio, north-eastern Peloponnese, Greece
Karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Typical scenery of limestone mountains and River Li at dawn, Guilin, Yangshou, Guangxi Province, China, Asia
Ingleborough seen from the limestone pavement on Twistleton Scar, North Yorkshire, England, United Kingdom, Europe
Early morning mist clinging to karst limestone scenery around Yangshuo, near Guilin, Guangxi Province, China, Asia
Tourist crossing a rope bride, Grand Tsingy, Tsingy du Bemaraha National Park, UNESCO World Heritage Site, western area, Madagascar, Africa
Ingleborough viewed from the limestone escarpment on Kingsdale, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
White travertine basins at sunset, Pamukkale, UNESCO World Heritage Site, Western Anatolia, Turkey, Asia Minor, Eurasia
Hilltop castle and village, El Castell de Guadalest, Alicante province, Spain, Europe
In Guilin, irrigation channel among rice paddies in area of limestone towers, Yangshuo, Guangxi Province, China
White travertine basins, Pamukkale, UNESCO World Heritage Site, Western Anatolia, Turkey, Asia Minor, Eurasia
Halong Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
Karst limestone scenery on the Li river (Lijiang) in Yangshuo, near Guilin, Guangxi Province, China, Asia
Rock climber tackles a very overhanging route on the famous limestone cliffs of the Gorge du Tarn in the Massif Central, near Millau and Rodez, south west France, Europe
Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.
Steps of limestone strata make a waterfall on the Rio Arazas, upper Ordesa Valley, Ordesa National Park, Pyrenees, Aragon, Spain, Europe
Limestone pavement and Ingleborough mountain, Ingleborough National Nature Reserve, Yorkshire Dales, North Yorkshire, England, United Kingdom, Europe
Misty limestone karst mountain landscape at sunrise, seen from Mount Zwegabin, Hpa An, Kayin State (Karen State), Myanmar (Burma), Asia
Craco ghost town abandoned by the population in the south of Italy, Basilicata, Italy, Europe
Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
Ancient stone carvings of arhats, Bodhisattvas and Buddhas on hillside of Feilaifeng (Flying Peak), Lingyin Temple, Hangzhou, Zhejiang Province, China
The red train of the Albula-Bernina Express Railway, UNESCO World Heritage on the famous Landwasser Viaduct, Switzerland, Europe
The red train of the Albula-Bernina Express Railway, UNESCO World Heritage on the Landwasser Viaduct, Switzerland, Europe
Landwasser Viadukt, Filisur, Graubunden, Swiss Alps, Switzerland, Europe
Landwasser Viadukt, Filisur, Graubunden, Swiss Alps, Switzerland, Europe
Three Natural Bridges of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia
Three Natural Bridges of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia
Limestone karst mountains and Thanlwin River, seen from Mount Zwegabin at sunset, Hpa An, Kayin State (Karen State), Myanmar (Burma), Asia
Rugged limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.
Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.
Katskhi Pillar, Georgia, Central Asia, Asia
Forest-covered limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.
Dovedale reflections, hikers on stepping stones and Thorpe Cloud, limestone gorge in spring, Peak District, Derbyshire, England, United Kingdom, Europe
Boats, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia
Limestone Sestrales massif and Anisclo Canyon, popular for hiking, Ordesa National Park, Pyrenees, Aragon, Spain, Europe
Sunset over limestone karst islands, Raja Ampat, West Papua, Spice Islands, Indonesia, Southeast Asia, Asia
A woman looks out across the hills of Catalonia from a rock ledge near the village of Siuarana, near Reus and Barcelona, Catalonia, Spain, Europe
Limestone peaks including 1231m Gunung Buntu Sarira and rice paddies in the River Sadang valley, Sarira, Toraja, South Sulawesi, Indonesia, Southeast Asia, Asia
Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
View of The Twelve (12) Apostles, Table Mountain Nature Reserve, from Camps Bay, Cape Town, Western Cape, South Africa, Africa
View of The Twelve (12) Apostles, Table Mountain Nature Reserve from Camps Bay, Cape Town, Western Cape, South Africa, Africa
Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
View of The Twelve (12) Apostles, Table Mountain Nature Reserve from Camps Bay, Cape Town, Western Cape, South Africa, Africa
View of The Twelve (12) Apostles, Table Mountain Nature Reserve from Camps Bay, Cape Town, Western Cape, South Africa, Africa
View of The Twelve (12) Apostles, Table Mountain Nature Reserve from Camps Bay, Cape Town, Western Cape, South Africa, Africa
Sunset over karst limestone scenery on the Li river (Lijiang) in Yangshuo, near Guilin, Guangxi Province, China, Asia
The 2341m limestone peak Pena Foratata, a great landmark in scenic upper Tena Valle, Sallent de Gallego, Pyrenees, Aragon, Spain, Europe
River boat on the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
View of The Twelve (12) Apostles, Table Mountain Nature Reserve from Camps Bay, Cape Town, Western Cape, South Africa, Africa
A woman looks out across the hills of Catalonia from a rock ledge near the village of Siuarana, near Reus and Barcelona, Catalonia, Spain, Europe
A climber tackles a steep route on limestone cliffs near the mountain town of Bielsa, central Pyrenees, Spain
The Bernina Express crossing the Wiesen Viaduct in the Swiss Canton of Graubunden, Switzerland, Europe
Temple standing between the scenic limestone mountains of Trang An Landscape Complex, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
Temple standing between the scenic limestone mountains of Trang An Landscape Complex, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
Bicycle in the sunset, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia
Waterfall on Rio Bellos river in the limestone Anisclo Canyon, Ordesa National Park, Anisclo, Pyrenees, Aragon, Spain, Europe
Karst limestone scenery surrounding a village in Yangshuo, near Guilin, Guangxi Province, China, Asia
Single tree on limestone pavement, Ingleborough National Nature Reserve, Yorkshire Dales, North Yorkshire, England, United Kingdom, Europe
View of limestone islets from the Piaynemo Island lookout, Raja Ampat, West Papua, Spice Islands, Indonesia, Southeast Asia, Asia
The Sunken Garden at Victoria's Butchart Gardens, planted in a former limestone quarry, starting in 1904, Victoria, Vancouver Island, British Columbia, Canada, North America
Limestone mountains in the scenic Trang An Landscape Complex, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
The Haute Ville perched on limestone cliffs in Bonifacio, Corsica, France, Mediterranean, Europe
Trees on limestone pavement, Ingleborough National Nature Reserve, Yorkshire Dales, North Yorkshire, England, United Kingdom, Europe
The Haute Ville perched on limestone cliffs in Bonifacio, Corsica, France, Mediterranean, Europe
Limestone mountains in the scenic Trang An Landscape Complex, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
Limestone mountains in the scenic Trang An Landscape Complex, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia
The Haute Ville perched on limestone cliffs in Bonifacio, Corsica, France, Mediterranean, Europe
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
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)
Watchtower arch of the Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China
The ancient Great Wall 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)
Frank Slide, where giant rockfall occurred in 1903, limestone debris fell 400m, Alberta, Canada, North America
The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)
Rock climber in action on the world-famous limestone cliffs of Chulilla, Valencia region, Spain
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, China
Boat on river, 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
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
Sunset, limestone mountain scenery, Tam Coc, Ninh Binh, south of Hanoi, North Vietnam, Southeast Asia, Asia