The Gallipoli peninsula (; ; i.e. "beautiful city") is located in Turkish Thrace (or East Thrace), the European part of Turkey, with the Aegean Sea to the west and the Dardanelles straits to the east. Gallipoli derives its name from the Greek "Καλλίπολις" (Kallipolis), meaning "Beautiful City". In antiquity, it was known as the Thracian Chersonese, from.
The peninsula runs in a south-westerly direction into the Aegean Sea, between the Hellespont (now known as the Dardanelles) and the bay of Melas (today Saros bay). Near Agora it was protected by a wall running across its full breadth. The isthmus traversed by the wall was only 36 stadia in breadth (about 6.5 km), but the length of the peninsula from this wall to its southern extremity, Cape Mastusia, was 420 stadia (about 77.5 km).