Jeju-do (in Korean: 제주도; also spelled in English Chejudo Island; Jejudo Island, "do" - 도 - means island in Korean) is an island south of the Korean peninsula known for its spirit population and a center of Korean shamanism.
It has been a major tourist attraction in Korea for over a century.
It is a mana-rich spot, with a very high presence of spirits. Background count in the area is at least 1 and around Mt. Hallasan, 3 (using the scale from 2060s).