The Giant's Causeway is located in County Antrim, on the northeast coast of Northern Ireland, near the town of Bushmills. It is an area of about 40,000 interlocking basalt columns which were the result of volcanic eruptions which occurred approximately 50 million years ago.
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 columns which have four, five, seven and eight sides. The tallest columns are about 12 metres (36 ft) high, and the solidified lava in the cliffs is 28 metres thick in places.
Giant's Causeway is the most popular tourist attraction in Northern Ireland.
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