noun
nearby mountain; mountain near a settlement
Refers to a mountain that is close to a village, town, or inhabited area, often used in contrast to deeper, remote mountains (奥山).
この村の外山には、昔から山菜がたくさん採れる。
On the nearby mountain of this village, many wild vegetables have been harvested since old times.
外山と奥山では、植生が大きく異なる。
The vegetation differs greatly between the nearby mountain and the deep mountain.
奥山 refers to a remote, deep mountain far from human habitation, while 外山 is a mountain close to a settlement.
Compound of 外 (to, 'outside') and 山 (yama, 'mountain'), referring to a mountain on the outskirts or near a settlement.