Ionian Sea

Either (1) a synonym of the Adriatic Sea, or (2) the southern continuation of that sea, south of the Strait of Otranto, between the heel of Italy and northwestern Greece: the sea in which the Ionian Islands—Corcyra (Corfu), Leucas, Cephallenia (Cephalonia), Ithaca, Zacynthus (Zante) etc.—are located

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Etymologically as well as geographically, the Ionian Sea has nothing to do with the Ionians or Ionia: its `o’ is not long (omega) but short (omicron), and its name was derived by Aeschylus from the mythical Io who swam from one coast to the other (though a later, alternative version instead derived the word from the Illyrian Ionios, son of Dyrrhachos).

The most remarkable crossing of the sea in historical times inaugurated the civil war between Antony and Octavian (the future Augustus) in 31 BC, when Octavian's admiral Marcus Agrippa sailed across, from west to east, much earlier in the year than naval opinion had considered practicable; and not even by the direct route, since he successfully made a long detour to Mothone in southern Greece. Antony's military position never recovered from this daring move, and his defeat at the battle of Actium was its logical outcome.