East Thrace the Turkish Straits) and the Sea of Marmara, a route of about 361 km. The southernmost part of Eastern Thrace is called the Gallipoli peninsula. European Turkey is bordered on the west by Greece for 212 km and on the north by Bulgaria for 269 km, with the Aegean Sea to the south-west and the Black Sea to the north-east. East Thrace was the setting for several important events in history and legend. The mass killings and displacement of Thracian Bulgarians in 1913 and the 1923 population exchange between Greece and Turkey ethnically cleansed the Orthodox populations. Prior to that
Provisional Government of Western Thrace along a ridge of the Rhodope mountains running west of Daridere and east of Madan up to the Bulgarian-Greek border. After the retreat of both the Bulgarian and Greek armies an autonomous state was declared with Ottoman support, in order to avoid Bulgarian rule after the Treaty of Bucharest, in which the Ottomans had not taken part. Under British pressure, the Bulgaria and the Ottomans signed the Treaty of Constantinople, which satisfied the Turkish claims to recognition of Eastern Thrace and recognized Western Thrace as part of Bulgaria. The Ottomans withdrew their forces and by 25 October, and the area