Page "Geography of Turkey" Paragraph 8

The boundary with Greece was confirmed by the Treaty of Lausanne in 1923, which resolved persistent boundary and territorial claims involving areas in Thrace and provided for a population exchange ( see: War of Independence ).

Under the agreement, most members of the sizable Greek-speaking community of western Turkey were forced to resettle in Greece, while the majority of the Turkish-speaking residents of Thrace who were not forced out during the Balkan wars were removed to Turkey.