
Jejudo Island is a volcanic island which is the largest island in South Korea. It is also the smallest province in Korea. The focal point of the island is Hallasan which is the tallest mountain in Korea and a dormant volcano that rises 1,950 meters above sea level. There are 360 satellite volcanoes that are connected to the main volcano. The last recorded volcanic activity was recorded approximately 800 years. The entire island is covered in volcanic rock and volcanic soil from Hallasan. The crater and lake are located at the peak of Hallasan was formed over 25,000 years ago.
