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Jeju Island is a volcanic island, dominated by Halla-san (Halla Mountain): a volcano 1,950 metres high and the highest mountain in South Korea.
The island was created entirely from volcanic eruptions approximately 2 million years ago,

登城山日出峰，99个大大小小的石峰像守卫一样护卫着日出峰喷火口，看起来像个巨大的城郭，因而起名叫“城山”看日出。  Hiking up Seongsan Sunrise Peak, a volcano crater perched on this eastern tip which complements the scenic wonder of a unforgettable memory of sunrise.  One of the would heritage site. 

夏日风苏州情 - 2010 年六月在苏州-侗俚-留园