Roughly counterclockwise from the northeast:
Thrace (Θράκη)
(Alexandroupoli, Komotini, Xanthi)
East Macedonia (Ανατολική Μακεδονία)
(Kavala, Drama)
Central Macedonia (Κεντρική Μακεδονία)
(Thessaloniki, Chalkidiki, Vergina, Katerini, Edessa, Veroia, Naousa)
West Macedonia (Δυτική Μακεδονία)
(Kastoria, Kozani)
Thessaly (Θεσσαλία)
(Larissa, Magnesia, Volos, Karditsa, Trikala, Mount Pelion, Meteora)
Sporades Islands (Σποράδες)
(Skiathos, Skopelos, Alonnisos, Skyros)
Epirus (Ήπειρος)
(Ioannina, Igoumenitsa)
Ionian Islands (Ιόνια νησιά)
(Corfu, Kefalonia, Zakynthos, Ithaca)
West Greece (Δυτική Ελλάδα)
(Patra, Agrinio, Messolonghi)
Central Greece (Στερεά Ελλάδα)
(Lamia, Thebae (also spelled as Thiva or Thebes), Livadia, Chalkis, Amfissa, Delphi)
Peloponnese (Πελοπόννησος)
(Corinth, Sparta, Nafplion, Argos, Kalamata, Tripolis, Monemvasia)
Attica (Αττική)
(Athens, Sounion, Kithira)
Crete (Κρήτη)
(Heraklion, Rethymno, Knossos, Chania, Gramvousa, Agios Nikolaos, Lassithi, Sitia, Ierapetra)
South Aegean Islands (Νότιο Αιγαίο)
Has two main groups: Cyclades: (Anafi, Andros, Amorgos, Folegandros, Ios, Mykonos, Naxos, Paros, Santorini, Sifnos, Koufonisi), and Dodecanese: (Kastelorizo, Astipalea, Kalymnos, Kassos, Karpathos, Kos, Leros, Nisyros, Patmos, Symi, Rhodes, Tilos)
North Aegean Islands (Βόρειο Αιγαίο)
(Lesvos, Chios, Samos, Lemnos, Aghios Efstratios, Psara, Thassos, Samothrace)