This is the 7120th most frequent Korean word.
제주도는
"Jeju Island is"
Here, '제주도는' introduces the subject as Jeju Island being discussed as a part of context.
제주도는 한국의 아름다운 섬입니다.
Jeju Island is a beautiful island in Korea.
In this case, '제주도는' sets up Jeju Island as the subject, focusing on its attributes of scenery and traditions.
제주도는 자연 경관 외에도 독특한 전통을 자랑합니다.
Jeju Island not only has natural scenery but also boasts unique traditions.
Here, '제주도는' establishes Jeju Island as the topic in relation to the forecast.