Basalt Columns by the Atlantic

Basalt Columns by the Atlantic is an original illustration set in Causeway Coast, Northern Ireland. It lies in high latitudes, where the climate is oceanic — mild, wet through the year.

Dark hexagonal stone columns descend like uneven steps into a steel-blue Atlantic swell, their wet tops reflecting a pale overcast sky. Layered green cliffs curve behind the shore, white foam threads between the joints, and the repeated polygon pattern remains clear without showing buildings, signs, or a staged tourist viewpoint.

Why does this lava shore break into thousands of stone polygons?

Because thick basaltic lava cooled from its exposed surfaces inward, thermal contraction divided the shrinking rock into regularly spaced fractures, commonly producing five- and six-sided columns. Later waves and erosion removed weaker material and revealed the tightly packed column ends as a pavement. The combination of geometric dark basalt, stormy ocean, and cool grassy cliffs therefore links volcanic cooling processes to Northern Ireland's Atlantic coast.

Terpano is a free daily geography puzzle. You study one original illustration, place a pin on a borderless terrain map, and see how close you were. There is no account and no sign-up; progress stays in your own browser. It plays in 11 languages.