This is the 10234th most frequent Korean word.
광주를
"광주를" is the object form of "광주," referring to the city of Gwangju in South Korea.
In this sentence, "광주를" is part of a preposition specifying the place the bus passes through, Gwangju.
이 버스는 광주를 지나서 대전으로 갑니다.
This bus passes through Gwangju and heads to Daejeon.
Here, "광주를" indicates the direct object of the verb 'to visit', specifying the city, Gwangju, as the destination of the action.
광주를 방문할 예정입니다.
I plan to visit Gwangju.
In this case, "광주를" indicates the location being traveled through before reaching Busan.