Original: Jeju-do (transliterated Korean for Jeju Province, short form of Jeju Special Autonomous Province) is the only special autonomous province of South Korea, situated on and coterminous with the country's largest island. Jeju-do lies in the Korea Strait, southwest of Jeollanam-do Province, of which it was a part before it became a separate province in 1946.
Simplified: Jeju-do (translated Korea for Jeju Province) is the largest island of South Korea.