Cunda Island; is a small island in the northwestern Aegean Sea off the coast of Ayvalik, part of Balýkesir City of Turkey. With an area of 23 km²., it's by far the largest island in the Ayvalik Islands group. It's located 16 km. east of Lesbos, Greece. The population numbered about 5,000 in 2000.
Cunda's linked to Ayvalik on the mainland by a causeway. The island has a typical resort town, Alibey, and a bus and ferry link to Ayvalýk.
The island's former Greek population was expelled in the 1923 population exchange between Greece and Turkey and was replaced by Muslims from Crete, Cretan Turks. The main landmark of Alibey village remains the large former Greek Orthodox cathedral, now abandoned and dilapidated.
Poroselene bay in the north of the island is probably the island’s major “sight.” In antiquity, it was the home of a dolphin who saved a drowning boy, mentioned by Pausanias.
In 2007 after a two-year-work, all 551 buildings in Cunda Island were inspected and registered by Turkish Science Academy and Yýldýz Technical University Faculty of Architecture within the "Turkey Culture Inventory Project".