Jeju is 73km wide and 41km long with a total area of 1,848 Jeju the largest island in South Korea, came into existence 700 to 1,200 thousand years ago when lava spewed from a sub-sea volcano and surfaced above the waters. Then 100 to 300 thousand years ago, another volcanic eruption formed Mt. Halla. The final volcanic eruption that took place approximately 25 thousand years ago created the crater lake, Baekrok-dam, at the summit of the mountain. Mt. Halla rises in the center of Jeju to 1950m above sea level. The fantastically shaped rocks decorating the seashores, the hundreds of Oreums(secondary volcanos) and the rarest species of flora around the Baekrok-dam lake in Mt. Hallasan are all treasures waiting to be discovered by visitors. One cannot see Jeju unless one looks.