rampart

suojavalli, suojamuuri A defensive mound of earth or a wall with a broad top and usually a stone parapet; a wall-like ridge of earth, stones or debris; an embankment for defensive purpose.
A defensive structure; a protective barrier; a bulwark.
That which defend defends against intrusion from outside; a protection.
puhekieltä A steep bank of a river or gorge.
To defend with a rampart; fortify or surround with a rampart.
Coleridge

Those grassy hills, those glittering dells, / Proudly ramparted with rocks.