This is the 7122nd most frequent Korean word.
제주에서
"From Jeju" or "In Jeju."
Here, '제주에서' (in Jeju) indicates the location where the action of walking is taking place.
제주에서 해변을 걷는 것이 좋아요.
I like walking on the beach in Jeju.
In this sentence, '제주에서' (in Jeju) specifies the origin of the tangerines, implying where they are grown.
제주에서 나는 귤은 정말 맛있어요.
The tangerines grown in Jeju are really delicious.
'제주에서' (in Jeju) here highlights the place where the activities of visiting tourist spots occurred.