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Sheltered lagoons, limestone islets and deserted beaches of the Lau group, or Exploring Isles, Northern Lau Group, Fiji, South Pacific

Limestone pinnacles on Mount Api, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia, Asia

View from coastal path of Durdle Door, arch of Purbeck limestone, near West Lulworth, Dorset, England, UK

Spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park in the Wulingyuan Scenic Area, Hunan Province, China

Poulnabrone dolmen megalithic tomb, Burren, County Clare, Munster, Republic of Ireland (Eire), EuropeThe Burren (from Irish: Boireann, meaning - great rock) is a unique karst landscape in northwest County Clare, Ireland. The limestone area measures 300 square kilometres and is roughly enclosed within the circle comprised by the villages Ballyvaughan, Kinvarra, Gort, Corrofin, Kilfenora, Lisdoonvarna and the Black Head lighthouse. The definitive article (ie "The" Burren) has only been added to the name by academics in the last few decades as it has always been traditionally called Boireann or Boirinn in Irish and Burren in English.

Limestone cliffs towering above turquoise sea, Navagio Bay, Anafonitria, Zakynthos (Zante) (Zakinthos), Ionian Islands, Greek Islands, Greece, Europe

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

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

Victorian terraced gardens in Umpherston Sinkhole in limestone, Mount Gambier, South Australia, Australia, Pacific

Red-hued limestone arch lit by morning sun with snowy cliffs in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Red-hued limestone arch lit by morning sun with snow in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

The 659m limestone Monte Cefano Nature Reserve and Custonaci marble quarries, on the coastline north east of Trapani, Custonaci, Sicily, Italy, Mediterranean, Europe

Lovely limestone cove at the Tonnara di Scopello, an old tuna fishery and now a popular beauty spot, Scopello, Trapani, Sicily, Mediterranean, Europe

Spring flowers and 659m limestone Monte Cefano, a Nature Reserve and hiking and climbing spot northeast of Trapani, Custonaci, Sicily, Italy, Mediterranean, Europe

Lovely limestone cove at the Tonnara di Scopello, an old tuna fishery and now a popular beauty spot, Scopello, Trapani, Sicily, Mediterranean, Europe

Spring flowers and 659m limestone Monte Cefano, a Nature Reserve and hiking and climbing spot northeast 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

Limestone rocks near the sea, at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe

Frankincense trees growing wild on the limestone hillsides, Dhofar Mountains, Salalah, southern Oman, Middle East

Panoramic view of the Vinales Valley showing limestone hills known as Mogotes, Vinales, UNESCO World Heritage Site, Cuba, West Indies, Central America

A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Clock tower and restaurants at dusk, Stradun, UNESCO World Heritage Site, Dubrovnik, Dalmatian Coast, Dalmatia, Croatia, Europe

Rector's Palace and Cathedral at dusk, UNESCO World Heritage Site, Dubrovnik, Dalmatian Coast, Dalmatia, Croatia, Europe

Chocolate Hills, conical hills in tropical limestone karst, Carmen, Bohol, Philippines, Southeast Asia, Asia

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

The limestone arch of Durdle Door and St. Oswald's Bay extending along the Jurassic Coast at dusk, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Clear waters between limestone islands, Hundred Islands, Lingayen Gulf, northern Luzon, Philippines, Southeast Asia, Asia

Animist hanging coffins still in use today, on limestone cliff in Echo Valley, Sagada, Cordillera, Luzon, Philippines, Southeast Asia, Asia

Motorway A7 road running through limestone desert, Paraje Natural de Karst en Yesos, Almeria, Andalusia, Spain, Europe

Heads carved into rocks at Enchanted Castle, Sciacca, Agrigento district, Sicily, Italy, Mediterranean, Europe

Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

View across Vinales Valley, UNESCO World Heritage Site, from Hotel Los Jasmines in stormy weather showing one of the limestone Magotes lit by the sun against mountains in shade, Vinales, Pinar Del Rio Province, Cuba, West Indies, Central America

Olive trees near village of Aldea de Guaro, limestone mountains, Periana, Axarquia, Andalusia, Spain, Europe

Scenic limestone cliffs with grassy slopes and rocky terrain under a cloudy sky in a mountainous region, North Yorkshire, England, United Kingdom, 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

Durdle Door beach on the Jurassic Coast in winter, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Durdle Door beach on a gorgeous sunny evening, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Durdle Door on a beautiful sunny day, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Snow capped Ingleborough and wind blown hawthorn tree on the limestone pavements on Twistleton Scar, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Gnarled tree growing through the limestone pavement on Twistleton Scar, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Twisted hawthorn trees growing through the limestone pavement on Twistleton Scar, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

A twisted very old Bristlecone Pine (Pinus longaeva), on sage brush covered slopes of dolomite limestone, in the Ancient Bristlecone Pine Forest Park, Inyo National Forest, Bishop, California, United States of America, North America

Church of St-Honorat, Alyscamps, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France

Doorway Arch, Santa Maria da Vitoria Monastery, UNESCO World Heritage Site, Batalha, Portugal, Europe

Waves break onto Durdle Door beach in winter, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Tsingy de Bemaraha Strict Nature Reserve, UNESCO World Heritage Site, near the western coast in Melaky Region, Madagascar, Africa

Tsingy de Bemaraha Strict Nature Reserve, UNESCO World Heritage Site, near the western coast in Melaky Region, Madagascar, Africa

Tsingy de Bemaraha Strict Nature Reserve, UNESCO World Heritage Site, near the western coast in Melaky Region, Madagascar, Africa

Limestone Pavement and Standing Stone,Twisleton Scar, Yorkshire Dales, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Dark clouds over Ingleborough from Twisleton Scar, Yorkshire Dales, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Limestone Pavement and Standing Stone,Twisleton Scar, Yorkshire Dales, North Yorkshire, Yorkshire, England, United Kingdom, Europe

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

Aerial view of Navagio Beach and shipwreck at Smugglers Cove on the coast of Zakynthos, Ionian Islands, Greek Islands, Greece, Europe

Ingleborough seen from the limestone pavement on Twistleton Scar, North Yorkshire, England, United Kingdom, Europe

Sunset over a solitary tree growing on the limestone pavement at Malham Lings, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Limestone cliffs above Malham Cove in the Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Limestone cave interior with many stalactites and stalagmites, Drach caves (Cuevas del Drach), Porto Cristo, Mallorca, Balearic Islands, Spain, Mediterranean, Europe

Ornate columns formed by many hanging stalactites and rising stalagmites coalescing, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe

Clock tower at dusk, Stradun, UNESCO World Heritage Site, Dubrovnik, Dalmatian Coast, Dalmatia, Croatia, Europe

Limestone desert landscape, Los Molinos del Río Aguas, Paraje Natural de Karst en Yesos de Sorbas, Almeria, Andalusia, Spain, Europe

Fort Lovrijenac (St. Lawrence Fortress) at sunrise, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe