Place guide · Bushmills
Giant's Causeway
Giant's CausewayA coastal expanse of around 40,000 interlocking basalt columns on the north coast of County Antrim, formed by an ancient volcanic eruption.
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A closer look
The columns step down to the sea in mostly hexagonal blocks, so regular that they look carved, though they are entirely natural.
The scale is intimate rather than vast; the pleasure is in stepping from one column top to the next and watching the waves break over the lower stones.
Grey basalt, green cliffs and grey Atlantic weather set the tone, and the light changes constantly as fronts move in off the sea.
Legend fills in the science: the stones are said to be the remains of a causeway built by the giant Finn McCool, a story the site leans into happily.
The causeway's columns were formed approximately 50-60 million years ago when basaltic lava flowed into the sea and cooled rapidly, contracting and fracturing into the hexagonal shapes that appear almost manufactured in their regularity.
The Giant's Gate, the Grand Causeway and the Shepherd's Steps are the most accessible sections of the formation, reached via a well-marked path from the visitor centre and offering the closest views of the interlocking column tops.
It is one of the most striking examples of columnar basalt anywhere and a textbook case of volcanic geology you can walk across.
The mix of hard science and Irish legend gives the place a double character that suits both geologists and storytellers.
The wider Causeway Coast, with its cliffs, paths and nearby sights, is one of the finest stretches of coastline in the British Isles.
The Giant's Causeway is a geological marvel: roughly 40,000 interlocking basalt columns formed during Paleogene volcanic activity, the upper surfaces worn by Atlantic weathering into step-like platforms that descend to the sea and appear precisely engineered despite being entirely natural.
Before you go
Current details checked July 2026
- Best season
- Late spring to early autumn gives the mildest weather and longest days; the coast is dramatic but harsh in winter storms.
Early or late in the day the light is best and the stones are quieter between coach arrivals.
Editorial guidance - Before you go 1
- Access to the stones themselves is free; the National Trust visitor centre and car park are charged, so plan parking ahead.Editorial guidance
- Before you go 2
- The rocks are uneven and slippery when wet; wear grippy shoes and keep well back from the sea in rough weather.Editorial guidance
- Before you go 3
- It is often windy and wet on this coast; bring proper waterproofs whatever the forecast.Editorial guidance
- Before you go 4
- A shuttle bus runs from the visitor centre down to the stones for those who prefer not to walk the slope.Editorial guidance
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Practical notes
Note 1
Around 40,000 basalt columns from a Paleogene eruption.
Note 2
On the north coast of County Antrim, Northern Ireland.
Note 3
A UNESCO World Heritage Site (year left as needs_review).
Note 4
Stones are free to access; visitor centre and parking are charged.