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.
Amongst the many places in Sithonia is the ancient city, the castle and the church of Agios Athanasios in Toroni, the windmills in Sikia and the 16th century church in Nikiti. Porto Koufo, is the largest and safest natural harbor in Greece, which is mentioned by Thucydides as "hollow harbor" it appears to be the fishing spot in the area.
South, from the harbors exit there is Kartalia, the most southern part of Sithonia, a very impressive area which puts its visitors under a spell with its rocky secluded beaches. Known for their natural beauty are the beaches Azapiko, Tristinika, Korakas, Marathias, Kalamitsi, Kriaritsi. All the villages cover the peninsula mainly in the central and the southern portions.
In the middle of Sithonia peninsula, near the village of Neos Marmaras, there is the famous holiday resort of Porto Carras; the place of the 2003 European Union leaders' Summit. The landscape is covered with forests, grasslands, and mountains.