Only Jeju. It’s the promotional catchphrase for the largest volcanic island in South Korea. One of the New 7 Wonders of Nature. UNESCO World Natural Heritage Sites – Hallasan Mountain, Seongsan Ilchulbong Tuff Cone, Geomunoreum LavaTube System and Geomunoreum. Emerald waters, majestic cliffs, towering mountains, lush forests and flower & grass fields dancing with the wind. It is overflowing with natural wonders. Truly, when God made Jeju-do, he was pleased with what he saw.