Chalkidiki or Halkidiki (in Greek: Χαλκιδική, alternative romanization Khalkidhikí) is one of the prefectures of Greece. It is located in the southeastern portion of Macedonia (Greece) (Central Macedonia). The Cholomontas or the Cholomon mountains lie in the northcentral part. It consists of a large peninsula in the northwestern Aegean Sea, resembling a hand with three "fingers" - Pallene (now Kassandra), Sithonia, and Ayion Oros (the ancient Acte), which contains Athos. The monasteries of Mount Athos are located on the easternmost "finger".