Hanna Mountain is one of the three famous mountains in South Korea. The altitude is 1,950 meters, and it is the highest mountain in South Korea. You can see it anywhere in Jeju Island. You can see it very clearly on the plane! The angle of view is different, the mountain is different, the season changes and the mountain is also changed, it is a mysterious mountain. Hanna Mountain, which means "the alpine mountain that can take down the Milky Way," has a 500-meter-diameter volcanic lake formed by volcanic eruptions about 25,000 years ago, surrounded by more than 360 small volcanoes formed by volcanic eruptions.