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거문오름 [유네스코 세계자연유산] · UNESCO World Natural Heritage Site · Jeju
Closed every Tuesday, January 1, the day of Seollal, the day of Chuseok.

Photos: Korea Tourism Organization (KOGL Type3), shown unaltered.
Source: Korea Tourism Organization open API (modified listing as published). Hours can change without notice — please check the official website or call before visiting.