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
First Army (Turkey) First Army (Turkey) The First Army of the Republic of Turkey () is one of the four field armies of the Turkish Army. Its headquarters is located at Selimiye Barracks in Istanbul. It guards the sensitive borders of Turkey with Greece and Bulgaria, including the straits Bosporus and Dardanelles. The First Army is stationed in East Thrace. Ali İhsan Sabis is the first commander of the 1st Army, which has been operating since the Ottoman Empire. The 1st army depends on the Turkish Land Forces. The army is responsible for the Thrace region, the straits and the safety of Istanbul.