At 1950 meters, this mountain in the center of Jeju Island is South Korea's highest. Formed of a shield volcano, the mountain has only one peak; there is a crater lake at the top. Technically, the volcano is still active. The locals believe the mountain is home to gods and spirits. Visitors to the mountain are here mainly to hike, though there is also the Buddhist Temple of Gwaneumsa, the oldest on the island. There are 5 hiking trails: Eorimok, Eoseungsaengak, Yeongsil, Seongpanak, and Gwaneumsa. They are very well developed and comprehensively take you through the mountain's thousands of species of plants and animals. The longest hike is less than 9 kilometers long, so each return trip hike can be done in a single day. The views from the top are spectacular. During peak seasons, the trails and top are quite crowded.