Giant's Causeway
Northern Ireland
The Giant's Causeway is a remarkable natural formation located on the north coast of Northern Ireland, near Bushmills. It consists of around 40,000 interlocking basalt columns, mostly hexagonal in shape, created by volcanic fissure eruptions approximately 50 to 60 million years ago during the Paleocene Epoch. The tallest columns reach about 12 meters high, with the lava cliffs up to 28 meters thick. This geological marvel is part of the North Atlantic Igneous Province and was once a volcanic plateau known as the Thulean Plateau. The site is managed largely by the National Trust and is one of Northern Ireland's most popular tourist destinations, offering free access to the causeway itself. The columns form natural stepping stones that extend from the cliff foot and disappear beneath the sea, creating a visually stunning landscape. The Giant's Causeway was designated a UNESCO World Heritage Site in 1986 and recognized as a geological heritage site by the International Union of Geological Sciences for its importance in the study of volcanology. Beyond its scientific significance, the site is steeped in Irish mythology, famously linked to the legend of the giant Fionn mac Cumhaill who is said to have built the causeway to challenge a Scottish giant. This blend of natural beauty, geological importance, and rich folklore makes the Giant's Causeway an unforgettable destination for visitors.
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Tip: For the best experience, visit in the early morning or late afternoon to avoid crowds and enjoy softer lighting for photography. Access to the Giant's Causeway itself is free, but purchasing tickets for the visitor centre in advance is recommended during peak seasons to avoid queues. Comfortable walking shoes are advised due to uneven terrain. Check weather conditions before visiting, as the coastal area can be windy and wet. Discounts are available for families, seniors, and groups via the visitor centre. Guided tours provide insightful context about the geology and legends of the site.
Interesting facts
- •The Giant's Causeway consists of about 40,000 interlocking basalt columns, mostly hexagonal but some with four to eight sides.
- •The tallest basalt columns reach approximately 12 meters (39 feet) high.
- •The site was declared a UNESCO World Heritage Site in 1986 and a national nature reserve in 1987.
- •The basalt columns are part of an ancient volcanic plateau called the Thulean Plateau formed during the Paleocene Epoch.
- •The International Union of Geological Sciences recognized the site as a key geological heritage site in 2022.
- •There are matching basalt columns at Fingal's Cave in Scotland, part of the same ancient lava flow.
- •The Irish name Clochán na bhFomhóraigh means 'stepping stones of the Fomhóraigh', linking the site to mythological beings.
History
The Giant's Causeway was formed around 50 to 60 million years ago during intense volcanic activity in the Paleocene Epoch when molten basalt lava cooled and contracted, fracturing into the distinctive polygonal columns seen today.
The site was part of the Thulean Plateau, a vast volcanic region.
It gained recognition as a national nature reserve in 1987 and was declared a UNESCO World Heritage Site in 1986, highlighting its global geological significance.
In 2022, it was further honored as one of 100 geological heritage sites worldwide by the International Union of Geological Sciences.
Over time, the site has become a symbol of natural heritage and cultural mythology in Northern Ireland.
Place Guide
Basalt Columns50-60 million years ago
The iconic polygonal basalt columns formed by cooling lava, mostly hexagonal, creating a natural stepping stone pathway along the coast.
Cliffs and Lava PlateauPaleocene Epoch
The cliffs adjacent to the columns reveal thick layers of solidified lava up to 28 meters thick, part of the ancient Thulean Plateau volcanic formation.
Visitor CentreModern
Managed by the National Trust, the visitor centre offers exhibitions on geology, local history, and mythology, enhancing visitor understanding of the site.
Contact
Phone: 028 2073 1855
