Alex Hyde / Group of Tissue moths (Triphosa dubitata) hibernating in a limestone cave. Peak District National Park, Derbyshire, UK. November.
Theo Bosboom / Patterns of algae on a limestone rock with sand, White sands beach, Causeway coast, Northern Ireland. April 2016.
Nick Upton / View towards Naranjo de Bulnes (Picu Urriellu) a distinctive 2519m limestone peak, Picos de Europa mountains, viewed from Arenas de Cabrales at sunset, Asturias, Spain, August 2016.
Dave Bevan / Slow motion clip of a pair of Common swifts (Apus apus) approaching and entering a nest hole in limestone cliff, Norfolk, England, UK, May.
Guy Edwardes / Grykes in limestone pavement at sunset,, Twisteleton Scar End, Yorkshire Dales National Park, Yorkshire, England, UK, May 2013.
Gavin Hellier / Aerial tracking shot along the shore towards Durdle Door, Dorset, England, UK, May 2017. (This image may be licensed either as rights managed or royalty free.)
Gavin Hellier / Aerial shot tracking over Lulworth Cove, Dorset, England, UK, May 2017. (This image may be licensed either as rights managed or royalty free.)
Gavin Hellier / Aerial shot tracking along chalk cliffs at sunset, near Old Harry Rocks, Dorset, England, UK, May 2017. (This image may be licensed either as rights managed or royalty free.)
Guy Edwardes / Lulworth Cove and Stair Hole at sunrise, West Lulworth, Dorset, England, UK. September 2015.
Guy Edwardes / Durdle Door, Dungy Head and Bats Head at sunset, Isle of Portland on horizon, Jurassic Coast, Dorset, England, UK. December 2014.
Guy Edwardes / Durdle Door and Bats Head at sunset, Jurassic Coast, Dorset, England, UK. December 2014.
Guy Edwardes / Durdle Door by moonlight, Jurassic Coast, Dorset, England, UK. December 2014.
Guy Edwardes / The Pinnacles, Swanage, Dorset, England, UK. May 2014.
David Noton / The Pinnacles at night, limestone formations. Nambung National Park, near Cervantes, Western Australia
Alex Hyde / Fairy's thimble flower (Campanula cochleariifolia) growing in a crack running through a limestone slab. Triglav National Park, Julian Alps, Slovenia. July.
Alex Hyde / Water cascading over naturally formed tufa dam. Tufa is a kind of limestone, formed from the precipitation of carbonate minerals which builds up around mosses and water plants to form a solid limeston...
Alex Hyde / European House Centipede (Scutigera coleoptrata) found on the ceiling of a limestone cave. Photographed on a white background in mobile field studio. Plitvice Lakes National Park, Croatia. November.
Alex Hyde / Close up of head of European House Centipede (Scutigera coleoptrata) in limestone cave. Plitvice Lakes National Park, Croatia. November.
Jurgen Freund / Schooling silversides (Atheriniformes) split level with karst limestone cliff and West Papuan fishermen in their dugout outrigger canoe. Raja Ampat, Indonesia. Second Place in the Portfolio Award of t...
Juan Carlos Munoz / People exploring underground lakes via rigid inflatable boat, Cross Cave (Krizna jama) under Cross Mountain, Green Karst, Slovenia, October 2014.
Alex Hyde / European Cave Spider (Meta menardi) in limestone cave. Plitvice Lakes National Park, Croatia. January.
Alex Hyde / Cave Cricket female (Troglophilus cavicola) on the side of stalactite in limestone cave. Plitvice Lakes National Park, Croatia. January.
Alex Hyde / Spider (Tegenaria sp.) in dew-covered web in limestone cave, Plitvice Lakes National Park, Croatia. January.
Alex Hyde / Supljara Cave, Plitvice Lakes National Park, Croatia. January 2014.
Alex Hyde / Egg sac of European Cave Spider (Meta menardi) suspended from roof of limestone cave. Plitvice Lakes National Park, Croatia. January.
David Noton / Dawn over the mountains and Nam Song River at Vang Vieng, Laos, March 2009.
Kirkendall-Spring / Travertine limestone terraces of Mammoth Hot Springs in Yellowstone National Park, Wyoming, USA, June 2013.
Colin Varndell / Coastal landscape of the beach at Swyre Head and Bat's Head west of Durdle Door, Dorset, UK February 2013
Graham Eaton / The Norber Erratics. Blocks of older Silurian sandstone, perched on top of younger Carboniferous limestone, that were left by retreating ice at the end of the last Ice Age, Clapham, Yorkshire, winter
Graham Eaton / Limestone pavement above Malham Cove, Yorkshire
SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley, Worcestershire.
Alex Hyde / Brittle Bladder / Common Fragile Fern (Cystopteris fragilis) growing in protective gryke in limestone pavement, Yorkshire Dales, UK. April.
Jack Dykinga / Matkatamiba Canyon with its Muave limestone scoured by erosion. Grand Canyon National Park, Arizona. May 2012.
David Noton / The white cliffs at Studland, Isle of Purbeck, Jurassic Coast, Dorset, England, UK. November 2011
Nick Turner / Downham Hill, a jurassic limestone outlier on the edge of the Cotswolds AONB conservation area, Gloucestershire, UK, October 2011.
Pete Oxford / Viales Valley with Tobacco crop, Sierra Rosario Mountain Range with Mojotes (limestone tree-covered knolls) UNESCO World Heritage site, Cuba, Caribbean, 2011
Florian Möllers / Chinese fisherman on his raft with Great Cormorant (Phalacrocorax carbo sinensis), silhouetted against the karst hills at the Li River. Yangshuo, Guangxi, China, November.
Florian Möllers / Chinese Fisherman on his raft with Great Cormorant (Phalacrocorax carbo sinensis), against the karst hills at the Li River. Yangshuo, Guangxi, China, November.
Jurgen Freund / Schooling Silverside fish (Antherinidae) split level with karst limestone walls, fan coral and featherstar, North Raja Ampat, West Papua, Indonesia, February 2002.
Jurgen Freund / Schooling Silverside fish (Antherinidae) split level with karst limestone walls, West Papuan fisherman in boat, North Raja Ampat, West Papua, Indonesia, February 2002.
Jurgen Freund / Silhouette of karst limestone outcrop and Coconut trees (Cocos nucifera) of Entalula Island at sunset. El Nido, Northern Palawan, May 2009.
Jurgen Freund / Outrigger boat in Big Lagoon, with its karst limestone cliffs, emerald waters and shallow coral reefs in the white sand. North Palawan, Philippines, May 2009.
Jurgen Freund / Aerial view of island with steep limestone cliffs, birds' nests amongst the caves are highly protected or guarded for their commercial value in the Chinese market, Palawan, Philippines, May 2009.
Inaki Relanzon / Limestone formations under a heavy sky. Torcal de Antequera Nature Reserve, Malaga, Spain, November 2009.
Jurgen Freund / Small, tree-covered islet. This is a karst limestone formation with layers eaten away by water. Raja Ampat, West Papua, Indonesia, February 2010
Jurgen Freund / Very old human skulls on a ledge in the karst limestone walls of a Raja Ampat island. Raja Ampat, West Papua, Indonesia, February 2010
Jurgen Freund / Ancient pictographs (rock / cave paintings) of fish and sea creatures on karst limestone formations. Sunmalelen area, Raja Ampat, West Papua, Indonesia, January 2010
Jurgen Freund / Karst limestone formations rising out of the sea. Sunmalelen area, Raja Ampat, West Papua, Indonesia, January 2010