Hallasan National Park (9.6 km), Seokgulam Trail (1.5 km), Gwaneumsa Trail (8.7 km), Donnaeko Trail (7 km), and Eoseungsaengak Trail (1.3 km). The longest trail is Seongpanak Trail which takes about 4.5 hours. Hallasan comprises 153.112 km of the Jeju Island. It rises 1.950 m above the sea level which means the highest mountain in South Korea. This mountain was formed in the fourth Cenozoic era by outburst of volcano. It is mostly composed of basalts. It is extending east and west, and it has high and gradual descent. On the other hand, the south part of the mountain is steep. In the
Hallasan and call out 노인성, they could live a longer life. The name represents a mountain that is located at the back side of a town and protects the town's residents. Jeju people called Hallasan Jinan because Hallasan blocked winds that were blowing from the Pacific Ocean and also protected the residents. Dumuak is another name for Hallasan. The name represents the bold head mountain. According to a legend, a hunter accidentally ripped God's belly button. God expressed his anger by ripping off the peak of Hallasan. The remaining part of the mountain became Baengnokdam (백록담) and the ripped part of