Adria in Fausset's Bible Dictionary

The gulf bounded on the E. by Dalmatia and Albania, and on the W. by Italy. It was often however understood in a wider sense, as by Paul's almost contemporary geographer, Ptolemy, namely, the Mare Superum, including the Ionian sea, between Sicily on the W., and Greece and Crete on the E., and Africa on the S., the "Syrtic basin" (Acts 27:17). So that the Melita of Acts 28 need not be looked for in the present Adriatic gulf, but may be identified with Malta. Adria, a town near the Po, gave its name. Malta marks the division between the Adriatic and Tyrrhenian (Mare Inferum) sea; the Corinthian isthmus divides the AEgean from the Adriatic.

Link: https://bible-history.com/faussets/A/Adria/