Halkidiki is a region of Macedonia and is geographically the end of Central Macedonia in the Aegean Sea, which penetrates deep into it, forming three elongated peninsulas, giving the area its characteristic shape, the so-called “Halkidiki legs”.
To the north-east there is the Marmari peninsula, between Akanthos and Strymonikos bay.
Halkidiki is a great peninsula, being surrounded by the Aegean Sea and only Northwest. is united with the trunk of Macedonia through the region of Thessaloniki. In the southern part of Halkidiki, three distinctive elongated peninsulas are formed from west to east: the peninsula of Kassandra, the Sithonia peninsula and the Mount Athos peninsula where the Mount Athos is located.
The capital of the prefecture of Chalkidiki is Polygyros with 6,121 inhabitants. The administrative center of Mount Athos is Karyes. The Halkidiki peninsula is administratively divided into the prefecture of Chalkidiki and the autonomous monastic state of Mount Athos. The northern part of the peninsula belongs to the prefecture of Thessaloniki.