Questions & Answers about san jeongsangeun ajik neomu meoreo.
산 정상 means the summit/top of the mountain.
It is made of:
- 산 = mountain
- 정상 = summit, peak, top
In Korean, nouns are often put together like this without 의, so 산 정상 is very natural.
You could also say 산의 정상, but that sounds a little more explicitly like the mountain’s summit. In everyday speech, 산 정상 is common and natural.
은 is the topic marker.
So 산 정상은 means something like:
- as for the mountain summit
- the mountain summit, on the other hand...
In this sentence, 은 helps set the summit as the topic being talked about. It can also give a slight contrastive feeling, like:
- other parts may be closer,
- but the summit is still far.
If you used 이/가 instead, the sentence would feel a bit more like simply identifying the subject. With 은, the speaker is presenting the summit as the thing being commented on.