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
Kaena Point with surfers of other North Shore locations. Kaena Point is located in a remote area with no direct paved road access and no rescue capabilities. Additionally, the point's geography results in undertows, dangerous rip currents and other hazardous ocean conditions that make any water activity highly dangerous. Ka'ena used to be an active shield volcano that formed about 15% of the island. It is also 5 million years old, making it the oldest volcano on Oahu. Ka'ena must have suffered a large collapse because of its large crater. When it became extinct, which was about 4.2 million years ago, it