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
Santa Margarida Volcano of the same eruption event 11,500 years ago, alternating freatomagmatic activity, between water and magma, and magmatic activity. Santa Margarida Volcano The Santa Margarida Volcano () is an extinct volcano in the comarca of Garrotxa, Catalonia, Spain. The volcano has a perimeter of 2 kilometers and a height of 682 meters and is part of the Garrotxa Volcanic Zone Natural Park. The hermitage of Santa Margarida, after which the volcano was named, is inside the crater of the volcano. The building was destroyed in 1428 during the 1428 Catalonia earthquake and rebuilt in 1865. A study published in 2011 at