Koyun Island
Koyun Island is a Turkish island in the Sea of Marmara. At it is a part of Erdek ilçe of Balıkesir Province. It is situated between the better known islands of Avşa Island and Paşalimanı Island.
The island is a long island from north to south. Its total area is about. There are only a few summer houses on the otherwise uninhabited island.