Walfisch is an uninhabited German island, in the Bay of Mecklenburg in the Baltic Sea. It lies approximately north of the city of Wismar, south of the island of Poel. The very flat island has a maximum circumference of about , a surface area of and is a nature reserve. History During the Thirty Years' War there was a fortress located on the island, which today is mainly under water. Relics of this are still being discovered today through aerial archaeology. The fortress of Walfisch was destroyed in the year 1717 after the Northern Wars. References Uninhabited islands of Germany German islands in the Baltic Wismar Bay of Wismar Islands of Mecklenburg-Western Pomerania