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
History of the Eastern Orthodox Church in the Ottoman Empire, culminating in the Armenian, Greek and Assyrian genocides. As a result, the 20th century saw a sharp decline of the number of Orthodox Christians, and of Christians in general, in the Anatolian peninsula amidst complaints of Turkish governmental repression of various Eastern and Oriental Orthodox groups. During the Lausanne Conference in 1923, the Turkish and Greek sides after some discussions accepted the proposal of a population exchange. Muslims in Greece (save the ones in Eastern Thrace) were expelled to Turkey, and Greek Orthodox people in Turkey (save the ones in Istanbul) were expelled to Greece. In