We wanted to stop at the monument to understand th...

We wanted to stop at the monument to understand this huge project initiated by the engineer Cornelius Lely in the 1930s.
This huge dike-dam closed this golf course in the North Sea and drained it which allowed the rivers to fill the new basin.
Thus, on the north side of the dam-dam, it is sea water and on the other side, a large freshwater lake.
Huge, powerful pumps at each end of the dyke make it possible to regulate the height of this large lake in case of excessive rain and rising water.