This week on Jeju: A to Z, Todd Thacker takes a brief look at a geological formation known as the (주상절리) Jusangjeolli columnar joints. Located in Daepo-dong, Seogwipo, the site is not only a natural monument and geosite, it’s also a great place for a photo-op.



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Jeju’s volcanic origins are scientifically important and often times quite beautiful. On the south side of the island, there is a famous coastal geological formation that attracts experts and the general public alike.

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Daepo-dong, Seogwipo

The Daepo Columnar Joints are a fascinating group of black basalt hexagon-shaped pillars some 600 meters southwest of Daepo-dong, Seogwipo.

These columnar joints, which are the best examples of such outcrops on the island, formed when viscous lava -- estimated to be 1,100 degrees Celsius -- emerged from an eruption point and immediately solidified.

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30 to 40 meters in height

They extend for about 1 kilometer along the Seogwipo coast and range from 30 to 40 meters in height.

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Natural Monument No. 433

Also known by their ancient name Jisatgae (지삿개), the columns were designated Natural Monument No. 433 in 2004. In 2010 it was named one of Jeju’s nine Geosites in the Global Geoparks Network.

In the past, this area was a place for local residents to collect their drinking water, which permeated through the rocks and collected on the surface of shallow tidal areas. It is therefore both a cultural and geological heritage site.

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Todd Thacker

Because the Daepo formation comes in contact with ocean, there is a certain amount of erosion visible. However, the crashing blue and white waves on these black geological marvels are perfect for photo ops. The location is also a popular spot for fishing.

All in all, it’s one of Jeju’s many must-see attractions.

Todd Thacker KCTV