The Death Strip (Todesstreifen) was the heavily fortified no-man’s-land between the two parallel walls that made up the Berlin Wall – the outer wall facing West Berlin and the inner wall on the East Berlin side.
The strip varied in width from just a few metres in dense urban areas to over 150 metres in outlying sections. Far from being simply an empty space, it was engineered as a killing zone designed to make escape virtually impossible.
Its fortifications evolved over the Wall’s 28-year existence, but by the 1980s, the Death Strip typically included:
The Death Strip was maintained with ruthless efficiency. Buildings, trees, and any structures that might provide cover were demolished. Along Bernauer Straße, entire apartment blocks were torn down to widen the strip.

For a detailed look at the fortifications, see how the Berlin Wall was guarded and the four generations of the Wall.