The Netherlands has many dikes, but only one can be the longest: the Afsluitdijk. This dike is 32 kilometers long and connects the provinces of Noord Holland and Friesland. The dike encloses the Wadden Sea from what used to be the Zuider Sea. Now the Zuider Sea is the IJsselmeer. The Zuider Sea was very important for trade and fishing. And yet the Afsluitdijk had to come. Why? You can find out in this short clip.