Seongsan Ilchulbong daybreak
gimnyeonggul Lava Tube
Mt. Hallasan is the central park of the gently sloping shield volcano of Jeju Islind.
There are about 360 oreums (volcanic cones) scattered throughout Jeju island.
Seongsan Ilchulbong is an archetypal tuff cone formed by hydrovolcanic ...
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