Ayvalık (Ancient Greek: Κυδωνίαι, Greek: Αϊβαλί aivali or Κυδωνίες) is a seasie town in the northwestern Aegean coast of Turkey. It is a district of the Balıkesir Province. It was alternatively called (Κυδωνίες - Kidonies) by the town's formerly important Greek population, although the use of the name Ayvalık was widespread for centuries among both the Turks and the Greeks (pronounced as Ayvali by the latter).