This is the 464th most frequent Chinese word.
位於
"Located at" or "situated at."
In this sentence, "位於" indicates the geographical location of the tower relative to the mountain top.
高塔位於山頂。
The tower is located on the mountain top.
Here, "位於" specifies the spatial position of the library within the campus context.
圖書館位於校園的中心。
The library is situated in the center of the campus.
"位於" in this usage denotes the placement or address of her office within a specific structure.