Ithaca or Ithaka (in Greek, Ιθάκη, Ithaki) is an island in the Ionian Sea, in Greece, with an area of 118 km² (45 sq. miles) and three thousand inhabitants. It is an independent municipality of the prefecture of Kefalonia and Ithaka, and lies off the northeast coast of Kefalonia. The municipality of Ithaca includes some smaller islands as well. The capital, Itháki (Vathý), has one of the world's largest natural harbours.