On the former Midden-Herenduin estate lies a tank ditch that was part of the defensive structures intended to stop Allied forces. The water was meant to block or at least slow down Allied tanks during a possible invasion. In this part of the landscape, German soldiers could make effective use of a water obstacle, unlike in other terrains where such defenses were harder to create.

Today, the tank ditch is still recognizable as a water-filled trench, often inhabited by waterfowl.

Be careful, in this area you are stepping in the Nationaal Park Zuid-Kennermerland. This site gives nature an important place to develop on its own. These are the rules you should follow:

- dogs are prohibited,

- do not step out of the pathway

- use only the pathways between sunrise and sunset

Check the site rules via: Gebiedsregels - Nationaal Park Zuid-Kennemerland