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
Emperor of China (volcano) have been defined as extinct based on their structural settings and their age, which is stated that the volcanic activity was estimated stopped after 7 Ma ago. The end of magmatic activity in the NEC ridge at 3 Ma is thought of as the result from the collision of Timor and the Wetar segment of the Sunda Arc. Emperor of China (volcano) Emperor of China is a submarine volcano in the western part of the Banda Sea, Indonesia. This volcano is part of a chain with Nieuwerkerk volcano, known scientifically as the "Emperor of China–Nieuwkerk" (NEC) ridge, the depth of