Sources and image creditsThe Utrecht water defence line: land that could be floodedBack to the article → Image creditsA map of forts and inundation areas in the Nieuwe Hollandse Waterlinie.No machine-readable author provided. NielsB assumed (based on copyright claims). · CC BY-SA 3.0A historical map of the Nieuwe Hollandse Waterlinie from 1852.AnonymousUnknown author · Public domain
