The Holy Mountain is the eastern of the three peninsulas of Halkidiki. It is approximately 60 km in length, 8 to 12 km in width, while its highest peak is Mount Athos, which reaches 2000 meters.

Gulfs that surround the peninsula are the Singitic Gulf to the west and the Toronean Gulf to the east. The mountain Itamos or Dragountelis is in the center of the peninsula.

Toroni is an ancient Greek city and a former municipality in the southwest edge of Sithonia peninsula in Halkidiki, Greece. Modern Toroni is a municipal unit in Sithonia, Halkidiki, Greece with a population of 4,036.