IrishClochán an Aifir,

promontory of basalt columns along 4 miles (6 km) of the northern coast of Northern Ireland. It lies on the edge of the Antrim plateau between Causeway Head and Benbane Head, some 25 miles (40 km) northeast of Londonderry. There are approximately 40,000 of these stone pillars, each typically with five to seven irregular sides, jutting out of the cliff faces as if they were steps creeping into the sea.

First documented in 1693, the formation has been intensively studied by geologists. The Giant's Causeway and its coastal environs were bequeathed to the National Trust (a British organization that promotes the preservation of natural and architectural wonders) in 1961. Subsequently, the site was extended to some 200 acres (80 hectares); it was added to UNESCO's World Heritage List (World Heritage site) in 1986. It is protected not only for its beauty but also because its cliffs, seashores, marshes, and grasslands are home to some 50 species of birds, as well as to more than 200 species of plants. Humans settled around the Giant's Causeway in the 19th century, but the site is now uninhabited. It does, however, attract some 300,000 tourists annually. Deriving its name from local folklore, it is fabled to be the work of giants, particularly of Finn MacCumhaill (MacCool), who built it as part of a causeway to the Scottish island of Staffa (which has similar rock formations) for motives of either love or war.