Jeju Island is a popular vacation site for both Koreans and internationals. This nation’s largest island (73 km wide and 31 km long) came into existence around a million years ago by lava spewed from a sub-sea volcano, and the other volcanic eruptions later formed Mt. Halla in the center of Jeju to 1950 m above sea level, which is the highest peak in South Korea, and crater lakes. This island is famous as a honeymoon destination and has over one million visitors each year. Jeju was registered as UNESCO’s designations in three different categories including World Natural Heritage, and also listed as one of the New Seven Wonders of Nature. ¬†View details about how to get to Jeju Island.