Giant's Causeway

Nature

Forty thousand stone columns on the coast of Northern Ireland, most of them six-sided.

On the north coast of Northern Ireland about 40,000 columns of dark stone stand packed together, like a pavement leading into the sea. Most have six sides, so neat that they look made by hand.

They are basalt. About 60 million years ago lava poured out here, and as it slowly cooled it shrank and cracked into columns, the way drying mud cracks into shapes.

columns
40,000
years old
60 million
the tallest columns
12 m
Giant's Causeway on the map