Ionian Sea, part of the Mediterranean Sea, S Europe, between Greece and S Italy. It is connected with the Adriatic Sea by the Strait of Otranto. The Gulf of Taranto and the Gulf of Corinth are its chief arms. The Ionian Islands lie in its eastern part. Kérkira and Pátrai (Greece) and Catania and Taranto (Italy) are the chief ports.
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