Since the Kallikratis Programme reform entered into effect in January 2011, Greece has consisted of 13 regions subdivided into a total of 325, from 2019 332 (Kleisthenis I Programme), municipalities. The 54 old prefectures and prefecture-level administrations have been largely retained as sub-units of the regions. Seven decentralised administrations group one to three regions for administrative purposes on a regional basis. There is one autonomous area, Mount Athos (, "Holy Mountain"), which borders the region of Central Macedonia.
Since the Kallikratis Programme reform entered into effect in January 2011, Greece has consisted of 13 regions subdivided into a total of 325, from 2019 332 (Kleisthenis I Programme), municipalities. The 54 old prefectures and prefecture-level administrations have been largely retained as sub-units of the regions. Seven decentralised administrations group one to three regions for administrative purposes on a regional basis. There is one autonomous area, Mount Athos (, "Holy Mountain"), which borders the region of Central Macedonia.