Until the Kallikratis reform in 2010, the prefectures (Greek: νομοί [noˈmi], sg. νομός [noˈmos̠]) were the second-level administrative regions of Greece. They are now defunct, and have been approximately replaced by regional units.
They are called departments in ISO 3166-2:GR and by the United Nations Group of Experts on Geographical Names.
The traditional geographic regions of Greece (Greek: γεωγραφικά διαμερίσματα, lit. 'geographic departments') are the country's main historical-geographic regions, and were also official administrative regional subdivisions of Greece until the 1987 administrative reform. Despite their replacement as first-level administrative units by only partly identical administrative regions (Greek: περιφέρειες), the nine traditional geographic regions—six on the mainland and three island groups—are still widely referred to in unofficial contexts and in daily discourse.
As of 2011, the official administrative divisions of Greece consist of 13 regions (Greek: περιφέρειες)—nine on the mainland and four island groups—which are further subdivided into 74 regional units and 325 municipalities. Formerly, there were also 54 prefectures or prefectural-level administrations.
The regions of Greece (Greek: περιφέρειες, romanized: periféreies) are the country's thirteen second-level administrative entities, counting decentralized administrations of Greece as first-level. Regions are divided into regional units, known as prefectures until 2011.
Attica Prefecture (Greek: Νομὸς Ἀττικῆς) was a prefecture of Greece, first established in 1833 and disestablished for the last time in 1987. The prefecture was coextensive with the present-day Attica region.
Continental Greece (Greek: Στερεά Ελλάδα, romanized: Stereá Elláda; formerly Χέρσος Ἑλλάς, Chérsos Ellás), colloquially known as Roumeli (Ρούμελη), is a traditional geographic region of Greece. In English, the area is usually called Central Greece, but the equivalent Greek term (Κεντρική Ελλάδα, Kentrikí Elláda) is more rarely used.
It includes the southern part of the Greek mainland (sans the Peloponnese), as well as the offshore island of Euboea. Since 1987, its territory has been divided among the administrative regions of Central Greece and Attica, and the regional unit (former prefecture) of Aetolia-Acarnania in the administrative region of Western Greece.
The Cyclades (/ˈsɪklədiːz/; Greek: Κυκλάδες, romanized: Kykládes, IPA: [ciˈkla.ðes]) are an island group in the Aegean Sea, southeast of mainland Greece and a former administrative prefecture of Greece. They are one of the island groups which constitute the Aegean archipelago. The name (Κυκλάδες νήσοι, Kykládes nísoi, 'encircling islands') refers to the archipelago forming a circle around the sacred island of Delos. The largest island of the Cyclades is Naxos; the most populated, however, is Syros.
Following the implementation on 1 September 2019 of the Kleisthenis I Programme, the administrative divisions of Greece consist of two main levels: the regions and the municipalities. In addition, a number of decentralized administrations overseeing the regions exist as part of the Ministry of the Interior, but are not part of local government. The old prefectures were either abolished and divided or transformed into regional units in 2011 by Kallikratis Plan. The administrative regions are divided into regional units which are further subdivided into municipalities. The Eastern Orthodox monastic community on Mount Athos is an autonomous self-governing entity.
The 74 regional units of Greece are the country's third-level administrative units (counting decentralized administrations as first-level). They are subdivisions of the country's 13 regions, and are further divided into municipalities.
They were introduced as part of the Kallikratis administrative reform on 1 January 2011 and are comparable in area and, on the mainland, coterminous with the "pre-Kallikratis" prefectures of Greece.