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Ireland has many geological attractions, most being along the coastline of the country. The two most famous geologically important destinations are both in Co. Clare; the Cliffs of Moher and The Burren. The Cliffs of Moher are one of the most visited sites in the country, with the rocks at the bottom of the cliffs dated as being about 320 million years old, formed when Ireland was under water during the Carboniferous Period. The Burren was also created during this period. When a tropical sea flooded the south of the country, a buildup of coral (Limestone) began, covering many places in Ireland. When the sea shallowed, rocks such as Sandstone and Shale were deposited over the Limestone, effectively covering it over again. The Burren is one of the largest karst landscapes in Europe and is one of the few places in the country where the limestone is visible above ground.