Chalcidice or Chalkidike or Chalkidiki or Halkidiki (Greek: Χαλκιδική, Chalkidikí, [xalciðiˈci]), is a peninsula and regional unit of Greece, part of the Region of Central Macedonia in Northern Greece. The autonomous Mount Athos region constitutes the easternmost part of the peninsula, but not of the regional unit. The capital of Chalkidiki is the main town of Polygyros, located in the centre of the peninsula.