The traditional geographic regions of Greece (Greek: ? , literally "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 the newly defined administrative regions (Greek: ), the nine traditional geographic divisions--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: )--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.