Attica Region (Greek: Περιφέρεια Αττικής, Periféria Attikís; IPA: [atiˈci]) is an administrative region of Greece, that encompasses the entire metropolitan area of Athens, the country’s capital and largest city. The region is coextensive with the former Attica Prefecture of Central Greece, but covers a greater area than the historical region of Attica.
Located on the eastern edge of Central Greece, Attica covers about 3,808 square kilometers. In addition to Athens, it contains within its area the cities of Eleusis, Megara, Laurium, and Marathon, as well as a small part of the Peloponnese peninsula and the islands of Salamis, Aegina, Angistri, Poros, Hydra, Spetses, Kythira, and Antikythera. About 3,750,000 people live in the region, of whom more than 95% are inhabitants of the Athens metropolitan area.
The region was established in the 1987 administrative reform, and until 2010 it comprised the 4 prefectures of Athens, East Attica, Piraeus and West Attica. With the 2010 Kallikratis plan, the region’s powers and authority were completely redefined and extended. Since 1 January 2011, the region represents the second-level local administration. While being supervised by the Decentralized Administration of Attica, it is now an independent self-governing body with powers and a budget comparable to the former prefectures. The region is subdivided into eight subordinate regional units: North Athens West Athens Central Athens South Athens West Attica East Attica Piraeus Islands