This is the 15753rd most frequent Korean word.
복산
"복산" means "double mountains" or "multiple mountains" in English.
Here, 복산 is used as a proper noun referring to a specific name of a mountain.
복산은 아름다운 산의 이름입니다.
Boksan is the name of a beautiful mountain.
In this sentence, 복산 again refers to a particular mountain that one might climb.
복산에 오르면 시원한 바람을 느낄 수 있어요.
If you climb Boksan, you can feel the cool breeze.
Here, 복산 is utilized as part of the name of an area, showing its geographical significance and associated activities.