noun
peripheral wall; surrounding wall
Refers to a wall that encloses or surrounds a space, such as a castle's outer wall or the wall around a compound. Often used in architectural or historical contexts.
See also: 壁
城の周壁は高く、敵の侵入を防いだ。
The castle's surrounding wall was high and prevented enemy intrusion.
遺跡の周壁の一部が今も残っている。
Part of the peripheral wall of the ruins still remains today.