Jeju-do is Korea's largest island with Natural World Heritage Sites all over the island. The island is arguably the most developed tourist site in Korea, giving a distinctive pleasure that comes from unique volcanic island scenery and culture. Aside from the landscape, various leisure, sports and cultural facilities are well established.
Area: 1,848.3㎢
Population: About 560,000
Jeju Tourism Guide
  - Tel: 064-1330
- Website: http://cyber.jeju.go.kr and http://jejuwnh.jeju.go.kr
Mt.Hallasan
Mt.Hallasan is a dormant volcano, formed in the Pliocene epoch (the second epoch of the Neogene period in the Cenozoic era). At the summit of the mountain lies a crater lake called Baengnokdam (literally "white deer lake"). Hallasan is rich in alpine plants with about 1,800 kinds. Thick forests, various plants, and grassland together present a great spectacle. Designated as a Natural World Heritage Site in 2007.
Seongsan Ilchulbong Tuff Cone
Of numerous craters in Jejo-do from 10000 years ago, Seongsan Ilchulbong Tuff Cone is a rare case in that a Surtseyan-type underwater eruption from a shallow seabed resulted in a tuff cone. It was originally a volcanic island, but was connected to land as sand and pebbles piled up between the island and land-side of Sinyang Beach. Designated as a Natural World Heritage Site in 2007.
Manjanggul Lava Tube
Manjanggul is the longest lava tube in the world with 5m width, 5-10m height, and 13,422m length. It is said that the lava, the result of volcanic eruption about 2.5million years ago, from Mt. Hallsan flowed down to the coast, creating the large lava tube as it is today.
Seopji Koji Cape
Legend has it that nymphs used to bathe at Seopji Koji. One day, the youngest son of the King of Heaven, saw the nymphs and begged his father to arrange a marriage. The king promised him to do that if he waited for 100 days. However, on the very 100th day, there were high waves and strong winds, preventing the nymph from descending. As the nymph did not show up, the sorrowful son then became a rock, standing upright at Seopji Koji.