Jeju (Jeju-do) : Jeju Island is the largest volcanic island in Korea. Officially called Jeju Special Self-Governing Province, this premier tourist destination boasts mild weather, as well as scenic beauties of beaches, waterfalls, cliffs and caves. Some of the top tourist sites include Hallasan National Park with a largely diverse species of flora and fauna, Seongsan Ilchulbong Peak with breathtaking views, and Manjanggul Cave, the world’s longest lava tube that has been registered as a UNESCO World Natural Heritage. Meanwhile, Jeju has recently won the Global Geopark certificate, and also has been selected as the New7Wonders of Nature.