The Cyclades are in a Sea.
The Cyclades ( [ ˈsɪklədiːz ] Κυκλάδες , [ cikˈlaðes ] ) are an 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 largest island of the Cyclades is Naxos . Irakleia or Heraklia is an island and a former community in the Cyclades , Greece . Sea of Crete . The Sea of Crete ( , Kritiko Pelagos ) is a sea , part of the Aegean Sea , located in its Southern extremity .