A berm is a level space, shelf, or raised barrier separating areas in a vertical way, especially partway up a long slope. It can serve as a terrace road, track, path, a fortification line, a border/separation barrier for navigation, good drainage, industry, or other purposes.
Embankment dam with two berms
A typical berm application
A separation barrier or separation wall is a barrier, wall or fence, constructed to limit the movement of people across a certain line or border, or to separate peoples or cultures. A separation barrier that runs along an internationally recognized border is known as a border barrier.
The Berlin Wall divided Berlin from 1961 until 1989, and was demolished between 1990 and 1992.
Green Line separation barrier, Cyprus
Rafah Border Crossing
The India-Pakistan border seen at night