Orestiada, is the northeasternmost, northernmost and newest city of Greece and the second largest town of the Evros regional unit of Thrace. Founded by Greek refugees from Edirne after the Treaty of Lausanne when the population exchange occurred between Turkey and Greece, in which the river Evros became the new border between the two countries. The population is around 20,000.

Western Thrace or West Thrace, also known as Greek Thrace or Aegean Thrace, is a geographic and historical region of Greece, between the Nestos and Evros rivers in the northeast of the country; East Thrace, which lies east of the river Evros, forms the European part of Turkey, and the area to the north, in Bulgaria, is known as Northern Thrace.