Cephalonia or Kefalonia, formerly also known as Kefallinia or Kephallenia (Greek: Κεφαλονιά or Κεφαλλονιά) is the largest of the Ionian Islands in western Greece. It is also a separate regional unit of the Ionian Islands region, and the only municipality of the regional unit. The capital of Cephalonia is Argostoli
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