generate questions: Since the Kallikratis programme reform entered into effect on 1 January 2011, Greece has consisted of thirteen regions subdivided into a total of 325 municipalities. The 54 old prefectures and prefecture-level administrations have been largely retained as sub-units of the regions. Seven decentralized administrations group one to three regions for administrative purposes on a regional basis. There is also one autonomous area, Mount Athos (Greek: Agio Oros, "Holy Mountain"), which borders the region of Central Macedonia.
How many regions exist in Greece since 2011? {sep_token} How many municipalities exist in Greece? {sep_token} What went into effect on January 1, 2011? {sep_token} What is the one autonomous area in Greece? {sep_token} Where is Mount Athos located? {sep_token}