Mt. Hallasan is the central peak of the gently sloping shield volcano of Jeju 
Island. It is the highest mountain in South Korea, reaching 1,950 m above the 
sea level. Mt. Hallasan boasts peculiar volcanic landscape, produced by the 
crater lake Baeknokdam at the summit, the precipitous rocky cliffs of the 
Yeongsilgiam, and about 40 volcanic cones. Baeknokdam crater is exceptional in 
that the western half of that area is formed by trachyte lava, whereas the 
eastern half is made of basalt lava. It is assumed that the trachytic lava dome 
was produced first followed by the creation of the crater by basaltic volcanic 
activity. The mountain has been protected from human activity since 1970 and is 
renowned for its unique ecology and biodiversity in addition to volcanic geology 
and geomorphology.
http://english.jeju.go.kr/index.php/contents/Tour

 
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