Westwall Tank Trench Near Berg

Three types of infantry obstacles come together near Berg: an anti-tank wall, a hump line and the wet anti-tank ditch. The ditch closed the gap between the upper Rhine terrace and an old arm of the Rhine, sealing off the gap between the Rhine and the Bienwald. (west-wall.de/index.php/westwall/panzersperren/panzergraeben/der-panzergraben-bei-berg)

An anti-tank ditch is a deep, wide and sometimes water-filled trench that is designed to defend against enemy tanks by preventing them from driving over it. In the First World War, during the first combat operations of tanks, it was noticed that tanks often got stuck in large shell craters and trenches. This is why the pioneers developed the anti-tank ditch to prevent or stop tank attacks. They were usually used when there was a lack of material for "classic" anti-tank barriers such as Czech hedgehogs or hump lines. In contrast to these, anti-tank ditches require hardly any building material, but significantly more manpower. Historically, they were mostly built by paramilitary units or civilians.
Source: de.wikipedia.org/wiki/Panzergraben