Refers to the top or upper part of a mountain. Often used in geographical descriptions, news reports, and literary contexts.
山上から見る景色は素晴らしい。
The view from the mountain top is wonderful.
山上に小さな神社がある。
There is a small shrine on the mountain top.
Compound of 山 (mountain) and 上 (top/above). The reading さんじょう is the on'yomi combination.