The Oostvaardersplassen (Dutch pronunciation: is a nature reserve in the Netherlands, covering about 56 square kilometres (22 sq mi). Despite having developed recently (it is in a polder which was only created in 1968) it already has international importance as a European wetland.
The Oostvaardersplassen can be divided into two areas: wet and dry. In the wet area along the Markermeer, there are large reedbeds on clay, where moulting geese often feed. This area is also home to Great Cormorant, Common Spoonbill, Great Egret, White-tailed Eagle and Eurasian Bittern, among many other animals.