Tyrrhenian Sea

Latin  Mare Tyrrhenum,  Italian  Mare Tirreno,   arm of the Mediterranean Sea, between the western coast of Italy and the islands of Corsica, Sardinia, and Sicily. It is connected with the Ligurian Sea (northwest) through the Tuscan Archipelago and with the Ionian Sea (southeast) through the Strait of Messina. Chief inlets of the sea include the Bay of Naples and the gulfs of Gaeta, Salerno, Policastro, and Sant'Eufemia.