Ithaca or Ithaka is an island located in the Ionian Sea, in Greece, with an area of 45 square miles (120 km) and a little more than three thousand inhabitants. It is also a separate regional unit of the Ionian Islands region, and the only municipality of the regional unit. It lies off the northeast coast of Kefalonia and to the west and within sight of continental Greece. The municipality of Ithaca includes some islets as well. The capital, Vathy or Ithaki, has one of the world's largest natural harbours. Modern Ithaca is generally identified with Homer's Ithaca, the home of Odysseus, whose delayed return to the island is one of the elements of the Odyssey's plot.