Adriatic Sea in the Ancient World

The term was used interchangeably with `Ionian Sea’ to denote the waters between Italy and the Balkan peninsula

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Later, it became convenient to call the northern and southern parts of this gulf the Adriatic and Ionian Seas respectively, with their division at the Straits of Otranto (although the Adriatic coast north of that point was also described as the Ionian Gulf).