I think its called a bunker
Yes some called it the big ditch or Clinton's Ditch.
The ditch around a castle is called a moat.
A deep ditch carved over time by running water is called a ravine.
The outer covering of the grain is called Husk.
Erie canal.
EURIPUS
ditch
The ditches at the sides of a country road are called "cunetas." Singular: "cuneta." (culverts). Trench, irrigation ditch = zanja
The layer covering the Earth is called the crust. Another name for the crust is called the lithosphere.
It's called a moat.
fissure, volcano, ditch, valley.
The ice covering 98% of the Antarctic continent is called an ice sheet.