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The Burren (Irish: Boireann, meaning "great rock", Boirinn, the dative form, is the modern form used by the Ordnance Survey) is a karst-landscape region or alvar in northwest County Clare, in Ireland. It is one of the largest karst landscapes in Europe. The region measures approximately 250 square kilometres and is enclosed roughly within the circle made by the villages Ballyvaughan, Kinvara, Tubber, Corofin, Kilfenora and Lisdoonvarna. It is bounded by the Atlantic and Galway Bay on the west and north, respectively.
A small portion of the Burren has been designated as Burren National Park. It is one of only six National Parks in Ireland and the smallest in size (15 km²). Three quarters of Ireland's species of flowers are found in the Burren.
The Burren area formed part of the territory of Corco Modhruadh, meaning "seed or people of Modhruadh" which was coextensive with the diocese of Kilfenora. At some point around the 12th Century, the territory was divided in two: Corco Modhruadh Iartharach ("Western Corcomroe") and Corco Modhruadh Oirthearach ("Eastern Corcomroe") also known as Boireann which in the late 16th century became the English administrative baronies of Corcomroe and Burren respectively. The O'Loughlin (Ó Lochlainn) clan ruled Boireann down to the mid 17th century from their chief residence at Gragans Castle (towerhouse not the house of the same name). The chief of the family was known in later times as the 'Prince of Burren' and clan members were buried in the family tomb near the altar of Corcomroe Abbey. Their kinsmen the O'Connor (Ó Conchubhair) clan ruled Corco Modhruadh Iartharach from Dough Castle near Liscannor. The villages and towns found within the medieval territory of Boireann include Lisdoonvarna, Ballyvaughan, New Quay / Burrin, Noughaval, Bealaclugga, Carron and Fanore / Craggagh.
Burren is rich with historical and archaeological sites. There are more than 90 megalithic tombs in the area, portal dolmens (including Poulnabrone dolmen), a Celtic high cross in the village of Kilfenora, and a number of ring forts - among them the triple ring fort Cahercommaun on the edge of an inland cliff, and the exceptionally well-preserved Caherconnell Stone Fort. Corcomroe Abbey is one of the area's main scenic attractions.
The rolling hills of Burren are composed of limestone pavements with criss-crossing cracks known as "grikes", leaving isolated rocks called "clints". The region supports arctic, Mediterranean and alpine plants side-by-side, due to the unusual environment. The limestones, which date from the Visean stage of the Lower Carboniferous, formed as sediments in a tropical sea approximately 350 million years ago. The strata contain fossil corals, crinoids, sea urchins and ammonites.
Glaciation during the Quaternary period facilitated greater denudation. The result is that the Burren is one of the finest examples of a glacio-karst landscape in the world. The effects of the last glacial period (the Midlandian) are most in evidence, with the Burren overrun by ice during this glaciation. The impact of earlier karstification (solutional erosion) has been eliminated by the last glacial period. So any surface karstification now seen dates from approximately 10,000 years ago and the Burren karst is thus recent. Solutional processes have widened and deepened the grikes of the limestone pavement. Pre-existing lines of weakness in the rock (vertical joints) contribute to the formation of extensive fissures separated by clints (flat pavement like slabs). The rock karstification facilitates the formation of subterranean drainage.
Climate and agriculture
The Burren has an unusually temperate climate. Average air temperatures range from 15°C in July to 6°C in January. The soil temperature does not usually drop below 6°C (end 2010 recorded a very unusual prolonged period of snow). Since grass will grow once the temperature rises above 6°C, this means that the Burren (like the neighbouring Aran Islands) has one of the longest growing seasons in Ireland or Britain, and supports diverse and rich plant growth. Late May is the sunniest time, and also likely the best time to view flowers, with the gentians and avens peaking (but orchid species blooming later.
During counter-guerilla operations in Burren in 1651-52, Edmund Ludlow stated, "(Burren) is a country where there is not enough water to drown a man, wood enough to hang one, nor earth enough to bury him...... and yet their cattle are very fat; for the grass growing in turfs of earth, of two or three foot square, that lie between the rocks, which are of limestone, is very sweet and nourishing."  
Flora and fauna
The Burren is renowned for its remarkable assemblage of plants and animals. The region supports many rare Irish species, some of which are only found in this area. Others occur in similar karst areas in western Ireland. Notable insects present in the Burren include the butterfly the Pearl-bordered Fritillary Boloria euphrosyne, Brown Hairstreak Thecla betulae, Marsh Fritillary Euphydryas aurinia and Wood White Leptidea sinapis; the moths, the Burren Green Calamia tridens, Irish Annulet Odontognophos dumetata and Transparent Burnet Zygaena purpuralis; the hoverfly Doros profuges and the water-beetle Ochthebius nilssoni. This last species is known from just 5 sites in the world, its type locality in northern Sweden and four marl lakes in the Burren.
The grykes (crevices) provide moist shelter, thus supporting a wide range of plants including dwarf shrubs. Where the surface of the pavement is shattered into gravel, many of the hardier Arctic or Alpine plants can be found. But when the limestone pavement is covered by a thin layer of soil, patches of grass are seen, interspersed with plants like the gentian and orchids.
The blue flower of the Spring Gentian, an alpine plant, is used as a symbol for the area by the tourist board.
The Burren is one of the main breeding areas in Ireland of the European Pine Marten.
Burren's many limestone cliffs, particularly the sea-cliffs at Ailladie, are popular with rock-climbers. For cavers, there are a number of charted caves in the area, notably Pollnagollum. Doolin is a popular "base camp" for cavers, and is home to one of the two main cave-rescue stores of the Irish Cave Rescue Organisation.
- Aillwee Cave
- Burren Action Group
- Cliffs of Moher
- Turlough (lake)
- Mullaghmore, County Clare
- Newtown Castle
- Temple Cronan
- D.A. Webb, 'Noteworthy Plants of the Burren', 1961, Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science
- ^ BBC: The Flowers of the Burren, County Clare, Ireland
- ^ A similar quote "The Burren affordeth not a piece of timber sufficient to hang a man, water in any one place to drown a man, or earth enough in any one part to bury him." can be found in "The Journal of Thomas Dineley", 1681, in the National Library of Ireland. Extracts from his journal, including his account of the Clare section of his journey, were published in the Journal of the Royal Society of Antiquaries, 6 (1867). These appear in an online version in "The History and Topography of the County of Clare" by James Frost Part II. History of Thomond Chapter 28 Barony of Burren
- McCarthy, P.M. and Mitchell, M.E. 1988. Lichens of the Burren Hills and the Aran Islands. Galway. Officina Typographica.
- Bilton, D.T., 1988. A survey of aquatic Coleoptera in Central Ireland and the Burren. Bulletin of the Irish biogeographical Society 11: 77-94.
- Foster, G.N., Nelson, B.H. & O Connor, A. 2009. Ireland Red List No. 1 - Water beetles. National Parks and Wildlife Service, Department of Environment, Heritage and Local Government, Dublin.
- O'Callagan, E., Foster, G.N., Bilton, D.T. & Reynolds, J.D. 2009 Ochthebius nilssoni Hebauer new for Ireland (Coleoptera: Hydraenidae), including a key to Irish Ochthebius and Enicocerus. Irish Naturalists' Journal 30: 19-23
- Sheehy Skeffington, M., Moran, J., O Connor, Á., Regan, E., Coxon, C. E., Scott, N. E. & Gormally, M. 2006. Turloughs – Ireland’s unique wetland habitat. Biological Conservation 133: 265-290.
- Anon. The Burren: A Guide. Shannonside Mid Western Regional Tourism Organization Ltd., 62, O'Connell St., Limerick.
- E. C. Nelson. Checklist of Plants of The Burren Region.
- D.A. Webb & M.J.P. Scannell. 1983 Flora of Connemara and The Burren. Royal Dublin Society & Cambridge University Press.
- T. J. Westropp. 1999. Archaeology of The Burren: Prehistoric Forts and Dolmens in North Clare. Clasp Press (reprint).
- D’Arcy & Hayward. The Natural History of The Burren.
- E.C. Nelson & W. Walsh. The Burren Wildflowers, Conservancy of The Burren, An Bothan, Ballyvaughan, Co. Clare.
- Hennessy, R., McNamara, M., & Hoctor, Z., 2010 Stone, Water & Ice: A Geology Trip Through the Burren. Burren Connect Project, pp. 64
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