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
Adatepe (volcano) an ancient mine in Adatepe. http://www.kircaalihaber.com/?pid=3&id_news=16068 Adatepe (volcano) Adatepe is an extinct volcano in southeast Bulgaria. As of 2011, there was debate about whether there should be gold mining. The some part of people considered that the mining of Adatepe can able to pollute the river which used for drinking water with cyanide immediately. As the result, the people were divided into two groups. The first group is people who demands the mining for a better life and the second group is people who considers that the regions gold is nature and silence. Despite all the reactions, the mine of