At Jeju Intercity Bus Terminal, Take a Direct Bus (Dongilju bus bound for Seongsan) and get off at Seongsalliipgu bus stop. (Travel time : 2 hrs)
This archetypal tuff cone was formed by hydrovolcanic eruptions over 100,000 years ago. The crater measures 90 meters high and nearly 600m in diameter. Sometimes referred to as "Sunrise Peak" it is situated on the eastern seaboard of Jeju Island and some say it resembles a massive old castle. It became a UNESCO World Heritage Site in 2007.