Corfu or Kerkyra is one of the Ionian Islands in western Greece, and the northernmost island on Greece's west coast except for its satellite Diapontian Islands, which are also the westernmost point of all Greece. Corfu and the Diapontian Islands mark the International Hydrographic Organization border between the Ionian Sea to the south and the Adriatic Sea to the north. Within the Ionian Islands region, the regional unit of Corfu extends as far south as the Paxoi. The capital and largest city of the regional unit is also named Corfu.