|Administrative region||Central Macedonia|
|• Municipality||516.8 km2 (199.5 sq mi)|
|• Municipal unit||322.9 km2 (124.7 sq mi)|
|• Municipality density||24/km2 (62/sq mi)|
|• Municipal unit||8,841|
|• Municipal unit density||27/km2 (71/sq mi)|
|Time zone||UTC+2 (EET)|
|• Summer (DST)||UTC+3 (EEST)|
Sithonia (Greek: Σιθωνία), also known as Longos, is a peninsula of Chalkidiki, which itself is located on a larger peninsula within Greece. The Kassandra Peninsula lies to the west of Sithonia and the Mount Athos peninsula to the east. Sithonia is also a municipality, covering the Sithonia peninsula. The seat of the municipality is the town Nikiti.
Gulfs that surround the peninsula are the Singitic Gulf to the east and the Toronean Gulf to the west. The mountain Itamos or Dragoudelis 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 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. The beaches of Azapiko, Tristinika, Korakas, Marathias, Kalamitsi, and Kriaritsi are in the area. 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, is the holiday resort of Porto Carras; the place of the 2003 European Union leaders' Summit. The landscape is covered with vineyards, forests, grasslands, shrubland and mountains.
The municipality Sithonia was formed at the 2011 local government reform by the merger of the following 2 former municipalities, that became municipal units:
The municipality has an area of 516.848 km2, the municipal unit 322.875 km2.
- Agios Nikolaos
- Armenistis Camping 
- Elia Akti or Elia, or Olive Beach
- Neos Marmaras
- Ormos Panagias
- Porto Carras Grand Resort
- Porto Koufos or Porto Koufo
- Pyrgaditika or Pyrgadikia
- Visit Sithonia
- Sithonia Guide
- Sithonia in Chalkidiki
- Sithonia Greece travel guide and information
- Visitor guide of Sithonia
|Wikimedia Commons has media related to Sithonia.|
- "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority.
- Kallikratis law Greece Ministry of Interior (in Greek)
- "Population & housing census 2001 (incl. area and average elevation)" (PDF) (in Greek). National Statistical Service of Greece.
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