Fener Island (literally "Lighthouse Island"), also known as Ayasandıras from its Greek name Agios Andreas (Άγιος Ανδρέας), is a Marmara island of Turkey. The island is to the east of Kapıdağ Peninsula at .Map page Administratively it is a part of Bandırma ilçe (district) of Balıkesir Province. It is a long and narrow island in north west to south east direction. The length of the longer dimension is . There are some islets to the east of the island.

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