Koog

A koog (plural: köge) or groden is a type of polder found on the North Sea coast of Germany that is established by the construction of dykes enclosing the land which is then drained to form marshland. This type of land reclamation is also used along rivers. In general, a koog is protected by embankments known as dykes (Deiche).

Westerkoog (Dithmarschen): typical koog landscape