This is the 15892nd most frequent Korean word.
부산광역시
Busan Metropolitan City.
Used as the subject to describe the city as a whole in terms of its size and location.
부산광역시는 한국에서 두 번째로 큰 도시입니다.
Busan Metropolitan City is the second largest city in South Korea.
Here, it is used as the object of the verb 여행하다 (to travel), indicating the destination.
부산광역시를 여행하는 것은 항상 즐거운 경험입니다.
Traveling to Busan Metropolitan City is always an enjoyable experience.
In this sentence, the word is used to specify the location where an event will take place, marked with the postposition 에서.