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https://allaboutworldheritage.com/2019/03/09/hiking-south-koreas-highest-mountain-an-idyllic-trek-to-the-top-of-mount-hallasan-on-jeju-island-paul-niel-scmp/
Hiking South Korea’s highest mountain: an idyllic trek to the top of Mount Hallasan on Jeju Island; Paul Niel; SCMP