The Giant's Causeway is a promontory of about 40,000 interlocking hexagonal basalt columns stepping from the Northern Ireland cliffs into the Atlantic. Toggle the tide level to see the lower columns covered and exposed, and the column-height bands to see how the uneven "steps" are formed.
Published figures: about 40,000 interlocking basalt columns; column tops mostly 20-90 cm across; tallest columns near 12 m; formed about 50-60 million years ago from cooling volcanic lava; UNESCO World Heritage Site since 1986.
Drag to orbit and scroll or pinch to zoom. Everything renders on your device with WebGL.
Giant's Causeway 3D Explorer
This browser explorer shows the Giant's Causeway as a dense field of hexagonal basalt column tops - a promontory of interlocking stone "steps" pushing out from the County Antrim cliffs into the North Atlantic. Toggle the tide level to see the outer, lower columns covered and exposed the way the real intertidal causeway is, and toggle the height bands to see how columns of different heights, not a smooth surface, create the stepping-stone look.
The columns formed about 50-60 million years ago when a lava flow cooled and contracted, cracking into mostly six-sided (some four to eight-sided) pillars - the same volcanic process that formed the columns at Fingal's Cave on the Scottish island of Staffa, part of the same ancient lava flow. Local legend credits the giant Finn McCool with building the causeway across to Scotland; that is a well-known myth, not the geological explanation.
- Toggle the tide level to compare low tide (fully exposed) with high tide (outer columns partly submerged)
- Toggle the height bands to see the color-coded column heights that form the "steps"
- Read column count, size, age, and heritage figures in the panel
- Drag to orbit, scroll or pinch to zoom
- Runs fully in the browser with the vendored three.js engine - no account, no upload
| Figure | Published value |
|---|---|
| Column count | about 40,000 interlocking basalt columns |
| Column shape | mostly hexagonal (six-sided); some four to eight-sided |
| Column top size | mostly about 20-90 cm across |
| Tallest columns | up to about 12 m |
| Formation age | about 50-60 million years ago, from a cooling volcanic lava flow |
| Location | County Antrim, Northern Ireland, on the north Atlantic coast |
| Heritage status | UNESCO World Heritage Site and National Nature Reserve since 1986 |
For other places shaped by unusual rock formations, open the Uluru 3D Explorer or the Cappadocia 3D Explorer.
The whole causeway scene - the hexagonal column field, the tide-level water plane, and the color-banded height toggle - is built and drawn on your own device with WebGL through the site-vendored three.js engine. Orbit the scene to see the promontory step from the cliff backdrop into the sea, and zoom in to compare the column tops. Nothing about your visit is uploaded to a server, and the engine loads once (about 0.7 MB) and is then cached.
This is an educational approximation - the column field, tide level, and height bands are schematic teaching cues, not survey data. The scene renders a representative dense field of columns rather than the literal 40,000, sized to read clearly at the intended camera distance.
Frequently Asked Questions
How many columns does the Giant's Causeway have?
About 40,000 interlocking basalt columns, mostly hexagonal (six-sided) with some four to eight-sided, forming a stepping-stone pavement out from the cliffs.
How did the Giant's Causeway form?
About 50-60 million years ago a volcanic eruption sent lava flowing across the area. As the thick lava sheet cooled and contracted, it cracked into regular columns - the same process that forms mud-crack patterns at a much larger, slower scale.
Is the Finn McCool legend true?
No - it is a well-known Irish legend, not a scientific explanation. The story says the giant Finn McCool built a causeway across to Scotland; geologically, the same lava flow does reach Fingal's Cave on the Scottish island of Staffa, which likely inspired the myth.
Where is the Giant's Causeway?
On the north Atlantic coast of County Antrim, Northern Ireland.
Is the Giant's Causeway covered by tides?
Yes - it sits on the intertidal coast, so the lower and outer columns are exposed at low tide and partly covered at high tide, the way the tide toggle in this explorer demonstrates.
Is this a scientific terrain model?
No. It is an educational explorer using published figures - the column field, tide level, and height bands are schematic teaching cues, not survey data, and the scene renders a representative dense field of columns rather than the literal 40,000.