The island of Cephalonia, also known as Kefalonia, Cephallenia, Cephallonia, Kefallinia, or Kefallonia, is the largest of the Ionian Islands in western Greece, with an area of 781 km². 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.

Source: wikipedia.org