Thessaloniki (; Greek: Θεσσαλονίκη [θesaloˈnici] ; also known by various spellings and names) is the capital and largest city of the administrative region of Central Macedonia, and the second-largest city in Greece. It is the largest city of Northern Greece, with over 300,000 in the city proper and slightly over one million inhabitants in its metropolitan area, the capital of the geographic region of Macedonia, and the Decentralized Administration of Macedonia and Thrace. It is also known in Greek as i Symprotévousa (η Συμπρωτεύουσα), literally "the co-capital", a reference to its historical status as the "co-reigning" city (Symvasilévousa/Συμβασιλεύουσα) of the Byzantine Empire alongside Constantinople.
Thessaloniki is located on the Thermaic Gulf, at the northwest corner of the Aegean Sea. It is bounded on the west by the delta of the Axios. The municipality of Thessaloniki, the historical centre, had a population of 319,045 in 2021, while the Thessaloniki metropolitan area had 1,006,112 inhabitants and the greater region had 1,092,919.
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