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 Thus, the distribution of mammals in Jeju Island is very poor in species and numbers because Jeju island is isolated from the Korean peninsula long ago. Their population has been reduced due to the decrease in food because of the use of rodenticides and pesticides in recent years and indiscreet fishing. Weasels, badgers, and gazelles are inhabited in Hallasan. The number of weasels and badgers are significantly reducing. Boar and Formosan deer is already extinct. Roe deer, the largest mammal in Hallasan, was once in danger of extinction. But now its population increased due to protection policies and a lot