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Tyrrhenian Sea(tĭrē`nēən), Ital. Tirreno, part of the Mediterranean Sea, c.475 mi (760 km) long and from 60 to 300 mi (97–483 km) wide, between the Ligurian Sea, the Italian peninsula, Sicily, Sardinia, and Corsica. The Strait of Messina connects it with the Ionian Sea. The sea is named for the Tyrrhenoi (an ancient name for the Etruscans). Naples and Palermo are the chief ports.
that part of the Mediterranean Sea that lies between the Italian Peninsula and the islands of Sicily, Sardinia, and Corsica. It is joined to other parts of the Mediterranean Sea by the Ligurian Sea on the north and by the Strait of Bonifacio on the west, the Strait of Sicily on the south, the Strait of Sardinia on the southwest, and the Strait of Messina on the southeast.
The Tyrrhenian Sea is a tectonic depression with a maximum depth of 3,719 m in its central portion. The surface water temperature varies from 22°–24.5°C in summer to 13.5°–14.5°C in winter. Salinity is between 37.25 and 38.25 parts per thousand. The surface currents create an overall cyclonic rotation, with vortices developing within it and moving in different directions. The maximum flow rate is 1 km per hour. There is fishing, primarily for sardines, tuna, eel, and swordfish. The chief ports are Naples, Palermo, and Cagliari in Italy and Bastia in France.