Giant's Causeway - MSN Encarta

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National Trust | Giant's Causeway
Geological phenomenon on the North Antrim coast renowned for its polygonal columns of layered basalt, the only World Heritage Site in Ireland
The Giants Causeway Website
A comprehensive guide to the Giant's Causeway situated on the north coast of County Antrim ... Giants Causeway - natural geological formations of hexagonal stones - a guide ...
Giant's Causeway - NI Tourist Board
The Giant's Causeway, renowned for its polygonal columns of layered basalt, is the only World Heritage Site in Northern Ireland.

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Giant's Causeway, rocky promontory on the northern coast of Northern Ireland. It consists of thousands of polygonal columns of basalt, a formation known as columnar jointing, ranging to more than 6 m (20 ft) in height, and each column reaching a maximum diameter of 50 cm (20 in). It is thought by geologists to have formed when an ancient lava flow rapidly cooled and solidified. Several hundred metres long, the causeway resembles a chequered pavement when viewed from above. Its name is derived from a local legend that the formation was built by giants as part of a roadway to Scotland. The Giant's Causeway was designated a UNESCO World Heritage Site in 1986.