This is the 2506th most frequent Japanese word.
十種ケ峰
"十種ケ峰" (Tokusa Mine) refers to a mountain located in Yamaguchi Prefecture, Japan.
In this sentence, the term 十種ケ峰 is used as the proper noun referring to the mountain itself, serving as the subject of the sentence.
十種ケ峰は日本の美しい山の一つです。
Mt. Tokusagamine is one of Japan's beautiful mountains.
Here, 十種ケ峰 references the mountain to specify the location from which the action of viewing took place, modifying 'summit'.
十種ケ峰の頂上から、周りの風景を眺めました。
I gazed at the surrounding scenery from the summit of Mt. Tokusagamine.
Within this sentence, 十種ケ峰 describes the destination of the hiking activity, providing detail about the context of the experience.