Italy is a peninsula in the centre the Mediterranean Sea, between the western and eastern basins of this sea. Rome lies of the cost Thyrrenian Sea (the western coast), in cent … ral Italy.2 people found this useful.taly is a peninsula in the centre the Mediterranean Sea, between the western and eastern basins of this sea. Rome lies of the cost Thyrrenian Sea (the western coast), in cent … ral Italy. 2 people found this useful.