Koyun Island

Koyun Island (Koyun Adası, literally "Sheep Island") is a Turkish island in the Sea of Marmara. At 40.50917°N, 27.57778°W it is a part of Erdek ilçe (district) 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 1.7 km2. There are only a few summer houses on the otherwise uninhabited island.