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.

아직 means still or yet.

In this sentence, it means the situation has not changed yet:

• the summit is still far away
• we haven’t reached the point where it feels close

So 아직 adds the idea of continuation: it was far before, and it remains far now.

너무 can mean different things depending on context:

• too, as in excessively
• sometimes so/very in casual speech

In 아직 너무 멀어, the natural meaning is too far or much too far.
Because 멀다 often describes an undesirable situation here, 너무 sounds like excessively rather than just very.

So the feeling is:

• It’s still way too far
• The summit is still far off

멀다 is the dictionary form.
멀어 is the casual present-tense form used in plain speech.

Conjugation:

• 멀다 → stem 멀-
• 멀어

So:

• 멀다 = to be far
• 멀어 = is far / it’s far

This sentence is in a casual style, probably something you would say to a friend while hiking.

More polite versions would be:

• 산 정상은 아직 너무 멀어요.
• 산 정상은 아직 너무 멉니다.

Korean often leaves out subjects when they are obvious from context.

English usually needs something like:

• The summit is still too far away
• We’re still too far from the summit

But Korean does not always need to say:

• who is speaking
• who is going
• what exactly is far from what

The context fills that in. If two people are climbing a mountain, 산 정상은 아직 너무 멀어 naturally means the summit is still far away from where they are now.

In this sentence, yes, it most naturally means physical distance.

멀다 can also be used more figuratively, for example:

• a goal is far off
• success is still far away
• a date is far in the future

But with 산 정상, the default reading is literal: the summit is physically far away.

It can be, depending on what you want to emphasize.

• 산 정상은 아직 너무 멀어 = The summit is still too far away
• 산 정상까지는 아직 너무 멀어 = It’s still too far to the summit

Adding 까지 makes the destination more explicit:

• up to / as far as / until

So 산 정상까지는 focuses more clearly on the remaining distance to the summit.
The original sentence is still natural, but 까지 can sound a little more precise in a hiking context.

The basic meaning stays the same even if the order changes somewhat, because Korean uses particles to show grammatical roles.

For example, these are possible:

• 산 정상은 아직 너무 멀어.
• 산 정상은 너무 아직 멀어. → less natural
• 아직 산 정상은 너무 멀어.

The original order is the most natural and smooth:

• topic: 산 정상은
• time/state: 아직
• degree: 너무
• adjective: 멀어

That order clearly builds up the meaning as: As for the summit, it is still too far.

산 정상은 아직 너무 멀어 is in a casual, informal style.

You would use it with:

• friends
• family
• someone younger
• people you speak casually with

Polite versions:

• 산 정상은 아직 너무 멀어요.
• 산 정상은 아직 너무 멉니다. → more formal

So the original sentence sounds natural in everyday conversation, especially between people hiking together.