Traditional regions of Greece

The traditional geographic regions of Greece 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, 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.
, the official administrative divisions of Greece consist of 13 regions —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.

Geographic region	Land area	Population 2021	Largest city	Post-1987 administrative region
Aegean Islands	9,165 km²	522,763	Rhodes	split into North Aegean, South Aegean
Central Greece	24,107 km²	4,495,920	Athens	split into Attica, Central Greece, part of Western Greece
Crete	8,341 km²	624,408	Heraklion	identical
Epirus	9,160 km²	319,991	Ioannina	identical
Ionian Islands	2,604 km²	208,176	Corfu	identical, apart from Kythira, which became part of Attica
Macedonia	34,213 km²	2,266,206	Thessaloniki	split into Western Macedonia, Central Macedonia, part of East Macedonia and Thrace
Peloponnese	21,782 km²	1,010,509	Patras	split into Peloponnese, part of Western Greece
Thessaly	14,051 km²	688,255	Larissa	identical
Thrace	8,594 km²	346,259	Alexandroupolis	merged into East Macedonia and Thrace