Houtribdijk is a 30km long dyke separating the Markermeer and Ijsselmeer and carries road traffic between Lelystad and Enkhuisen.
The Krabbersgat Naviduct, is the channel of water that allows water traffic to move between the two. Although it is an aqueduct, it has locks at both ends, it is called a naviduct. There are two water channels which means boats can cross at the same time. It is the first naviduct to be built, commissioned in 1995 and completed in 2003 at a cost of €55 million. Before it was constructed, water traffic had to use the Krabbersgat lock (near Enkhuizen) or the Houtrib lock (near Lelystad).
It has been so successful there are plans to replace other locks and road crossings with something similar.
It is exciting to cross in a boat with the road traffic thundering beneath.