also: さいしゅう
noun
Jeju (island and province in South Korea)
Refers to Jeju Special Self-Governing Province and its main island. Often used in travel, geography, and news contexts.
済州島は韓国最大の島です。
Jeju Island is the largest island in South Korea.
来月、済州へ旅行に行く予定です。
I plan to travel to Jeju next month.
From Korean 제주 (Jeju). The kanji 済州 are used as ateji for the Korean name.