Greece, Gr. Hellas or Ellas, republic (2005 est. pop. 10,668,000), 50,944 sq mi (131,945 sq km), SE Europe. It occupies the southernmost part of the Balkan Peninsula and borders on the Ionian Sea in the west, on the Mediterranean Sea in the south, on the Aegean Sea in the east, on Turkey and Bulgaria in the northeast, on Macedonia in the north, and on Albania in the northwest. Athens is its capital and largest city.