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
Western Thrace following years, the Central Powers (Germany, Austria-Hungary, and the Ottoman Empire), with which Bulgaria had sided, lost World War I and as a result Western Thrace was withdrawn from Bulgaria under the terms of the 1919 Treaty of Neuilly. Western Thrace was under temporary management of the Entente led by French General Charles Antoine Charpy. In the second half of April 1920 in San Remo conference of the prime ministers of the main allies of the Entente powers (except the US) Western Thrace was given to Greece. Throughout the Balkan Wars and World War I, Bulgaria, Greece and Turkey each