Halkidiki is a region of Macedonia and geographically it is the end of Central Macedonia at the Aegean Sea, which penetrates deep into it, forming three elongated peninsulas, which give the region its characteristic shape (“legs of Halkidiki”). To the northeast there is the peninsula of Marmari, between Akanthios and Strymonikos Gulf. Halkidiki is a large peninsula, since it is surrounded by the Aegean Sea and only north-west of it is united with the trunk of Macedonia through the region of Thessaloniki. In the southern part of Halkidiki, three characteristic elongated peninsulas are formed from west to east: the peninsula of Kassandra, the peninsula of Sithonia and the peninsula of Athos.