This is the 10652nd most frequent Korean word.
군공항이
"Military airport."
'군공항이' serves as the subject of the question, referring to the entity whose distance is being queried.
여기서 군공항이 얼마나 떨어져 있나요?
How far is the military airport from here?
In this sentence, '군공항이' is again the subject, this time in a locational context, grounding the statement about the surroundings.
군공항이 주위에는 높은 건물이 많지 않습니다.
There aren't many tall buildings around the military airport.
Here, '군공항이' functions as the subject of the sentence, indicating the entity that was expanded.