This is the 4528th most frequent Japanese word.
山頂
"Summit" or "mountaintop."
In this sentence, "山頂" (mountain summit) is used as the subject of the sentence to describe a viewpoint.
山頂からの景色は本当に素晴らしいです。
The view from the summit is truly wonderful.
Here, "山頂" represents the destination location that the speaker reached after an activity.
私たちは約三時間で山頂に到達しました。
We reached the summit in about three hours.
In this statement, "山頂" indicates the location where an activity (resting) took place.