The Burren (Irish: Boireann, meaning "Great rock") is a unique karst-landscape region in northwest County Clare, in Ireland and 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.
The Burren is rich with historical and archeological 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.
During counter guerilla operations in the Burren in 1651-52, Ludlow stated "It 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"
The rolling hills of the Burren are composed of limestone pavements with crisscrossing 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 blue flower of the Spring Gentian, an Alpine plant, is used as a symbol for the area by the tourist board. Burren's many limestone cliffs, particularly the sea-cliffs at Ailladie, near Fanore, are popular with rock-climbers. For potholers, there are a number of charted caves in the area. Doolin is a popular "base camp" for cavers.
Reference: Wikipedia