Koos is the largest of several small islands in the Bay of Greifswald, Mecklenburg-Vorpommern, Germany. It has an area of 772 hectares and a maximum elevation of just above three meters. The island is a largely uninhabited natural reserve with restricted access. It is separated from the mainland by Kooser Bucht and Kooser See, two bays connected by a tiny strait, Beek.
In 1241, Barnuta, prince of Rügen, granted Koos (then "Chosten") to Eldena abbey (then "Hilda"), later it became a possession of the Hanseatic town of Greifswald, located a few kilometers southward. A medieval burgh has been suggested on the isle, but not verified. A 17th-century Dutch settlement had disappeared in the 18th century. Koos is administered by the nearby town of Greifswald.
- Map of Koos, elevation and settlements detailed
- Declaration of Koos as part of a Naturschutzgebiet "Insel Koos, Kooser See und Wampener Riff" "Archived copy". Archived from the original on 2011-07-16. Retrieved 2009-05-27.CS1 maint: archived copy as title (link)
- The island is off limits to the general public; driving to the island with a motor vehicle is only permitted to authorised individuals. Detailed list of protected areas within the Greifswald city limits
- Christian Lübke, Struktur und Wandel im Früh- und Hochmittelalter: eine Bestandsaufnahme aktueller Forschungen zur Germania Slavica, Franz Steiner Verlag, 1998, p. 308, ISBN 3-515-07114-8
- Christian Lübke, Struktur und Wandel im Früh- und Hochmittelalter: eine Bestandsaufnahme aktueller Forschungen zur Germania Slavica, Franz Steiner Verlag, 1998, p.305, ISBN 3-515-07114-8
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