Traditional regions of Greece

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 largest of the geographical regions in size is Macedonia and the largest in population is Central Greece. The Ionian Islands are the smallest in both size and population.