Decentralized Administration of Macedonia and Thrace municipalities and regions, in this case the 60 municipalities of Central Macedonia and of Eastern Macedonia and Thrace, and the two regions themselves. Covering an area of "Macedonia and Thrace" is the largest of the seven decentralized administrations by area, and with an overall population of it is also the second most populated one, following the Decentralized Administration of Attica. In the revised European NUTS nomenclature, the two regions of "Macedonia and Thrace" together with the two regions of the Decentralized Administration of Epirus and Western Macedonia form the first level NUTS region EL5 (Voreia Ellada). The Decentralized Administration is
Turks of Western Thrace province of East Macedonia and Thrace. However, the Greek language is also widely used. Article 37 through 45 of the Lausanne Treaty set forth the obligations of the Greek and Turkish governments to protect the Turkish and Greek minorities in their territories. Each country agreed to provide the following: The Lausanne Treaty defined the rights of the Muslim communities in Western Thrace, on the basis of religion, not ethnicity, as well as maintained a balance between the minority communities of both countries (Turks in Greece and Greeks in Turkey) on reciprocal obligations toward each of those minorities. The Treaty contained