An Introduction to the Defence Line of Amsterdam

This eBook is meant as a quick introduction to the Defence Line of Amsterdam as a whole.


The Defence Line of Amsterdam is a 135 kilometre long defensive ring around the Dutch capital. It was built between 1881 and 1914 and circled the city at a distance of 15 to 20 kilometers.


Although the 46 forts and other defensive constructions are its most visible elements, inundated polders were the essence of the line's defensive power. These proved a very efficient means of defence and the Defence Line elevated inundations to an art form. This is one of the main reasons why the Defence Line of Amsterdam was inscribed on UNESCO’s World Heritage List due to its 'outstanding universal value'.