The Tyrrhenian Sea (Corsican: Mari Tirrenu, French: Mer Tyrrhénienne, Italian: Mar Tirreno, Neapolitan: Mar Tirreno, Sardinian: Mare Tirrenu, Sicilian: Mari Tirrenu) is part of the Mediterranean Sea off the western coast of Italy.
Ti Baybay Tirreno (Korso : Mari Tirrenu, Pranses: Mer Tyrrhénienne [mɛʁ tiʁenjɛn], Italiano: Mar Tirreno [mar tirˈrɛːno], Napolitano: Mar Tirreno, Sardo: Mare Tirrenu, Siciliano: Mari Tirrenu) ket parte ti Baybay Mediteraneo idiay akinlaud nga aplaya ti Italia.