Hallasan National Park Hallasan National Park Hallasan National Park () is located in the province of Jeju-do, South Korea. It was designated as the 9th national park in 1970. It features the highest mountain in South Korea, the shield volcano Hallasan on Jeju Island. It was designated a UNESCO Biosphere Reserve in 2002, and a World Heritage Site in 2007. Hallasan National Park is managed by Jeju Special Self-Governing Province. It is the only out of 20 national parks that is not managed by the Korea National Park Service. Hallasan has 7 trails: Eorimok Trail (6.8 km), Yeongsil Trail (5.8 km), Seongpanak Trail
Hallasan than in other areas, and the lowest temperature often appears at night. When the weak northwestern synoptic winds are blown, the lowest temperature appears in the eastern part of Jeju Island. The chill of the top of Hallasan descends downhill along the mountain range and is collected in the eastern part of Jeju Island so the morning temperature drops a lot. For the last five years, the deviation of temperature (maximum temperature - minimum temperature) increased in spring between March and May. The reason for the large deviation in spring is because the phenomenon occurs frequently by Hallasan. Hallasan was