Basaltic formations, Giant’s Causeway, Antrim, Northern Ireland.
The Giant’s Causeway, located in County Antrim, on the northeast coast of Northern Ireland, is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic eruption. The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. Most of the columns are hexagonal, although there are also some with four, five, seven and eight sides. The tallest are about 12 metres high, and the solidified lava in the cliffs is 28 metres thick in places.