The Thracian Chersonese (Greek: Θρᾳκικὴ Χερσόνησoς, Thrakike Khersonesos) was the ancient name of the Gallipoli peninsula, in the part of historic Thrace that is now part of modern Turkey.
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).
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