Background
In the past, the Westzaan Natura 2000 site was an area of brackish water due to a regular inflow of salt water. However, since the closure of the Zuider Zee in 1932 by the Afsluitdijk between Friesland and Noord-Holland, the water has become fresh, threatening the ecological value of the site. Westzaan is one of the few areas where a former bra ...