The gulf includes the islands of Aegina-Poros-Idhra and Spetses ,with a lot of beauty-full places in the mainland of Greece like korfos-Palaia Epidavros-Vathi in Methana-Ermioni and N.Khinitsa close to the marina of Porto Kheli. The city of Athens lies on the north edge of the gulf.
The Cyclades (ˈsɪklədiːz/; Greek: Κυκλάδες, [cikˈlaðes]) is a Greek island group in the Aegean Sea, southeast of mainland Greece and a former administrative prefecture of Greece. They are one of the island groups which constitute the Aegean archipelago. The name refers to the islands around (κυκλάς), the sacred island of Delos. The Cyclades is where the native Greek breed of cat (the Aegean cat) originated.
The Ionian Islands (Modern Greek: Ιόνια νησιά, Ionia nisia; Ancient Greek, Katharevousa: Ἰόνιοι Νῆσοι, Ionioi Nēsoi; Italian: Isole Ionie) are a group of islands in Greece. They are traditionally called the Heptanese, i.e. "the Seven Islands" Greek: Ἑπτάνησα, Heptanēsa or Ἑπτάνησος, Heptanēsos; Italian: Eptaneso), but the group includes many smaller islands as well as the seven principal ones.
Dodecanese literally 'twelve islands' are a group of 12 larger plus 150 smaller Greek islands in the Aegean Sea, of which 26 are inhabited. Τhis island group generally defines the eastern limit of the Sea of Crete. They belong to the Southern Sporades island group. They have a rich history, and many of even the smallest inhabited islands boast dozens of Byzantinechurches and medieval castles.