This view is nearly the opposite of yesterday`s pic.
The lake all those boats sail on
Wikipedia :
Grevelingen or Grevelingenmeer (Lake Grevelingen) is a former Rhine-Meuse estuary on the border of the Dutch provinces of South Holland and Zeeland that has become a lake due to the Delta Works.
It is situated between the former islands of Goeree-Overflakkee (South Holland) and Schouwen-Duiveland (Zeeland) which are connected by the Brouwersdam on the west and theGrevelingendam on the east