rugged mountain (of a pair)
Refers to the more rugged or masculine-looking mountain when contrasting two mountains, often paired with 女山 (めやま) for the gentler one. A somewhat poetic or descriptive term.
See also: 女山
In this area, you can see the rugged mountain and the gentle mountain side by side.
Compound of 男 (おとこ, 'man') and 山 (やま, 'mountain'), literally 'man mountain', used to describe a rugged mountain in contrast to a gentler 'woman mountain' (女山).