For those interested in what it protects: https://i2.wp.com/upload.wikimedia.org/wikipedia/commons/thumb/3/3f/NL-Zuiderzeeworks.svg/507px-NL-Zuiderzeeworks.svg.

For those interested in what it protects: https://i2.wp.com/upload.wikimedia.org/wikipedia/commons/thumb/3/3f/NL-Zuiderzeeworks.svg/507px-NL-Zuiderzeeworks.svg.png?ssl=1 https://i2.wp.com/upload.wikimedia.org/wikipedia/commons/thu... Also, this enclosure lead to former islands being enclosed by new land: https://en.wikipedia.org/wiki/Schokland https://en.wikipedia.org/wiki/Schokland