The portion of the Mediterranean commonly termed the Tyrrhenian Sea forms its limit on the W.
from the Adriatic, while about double that distance separates it from the Tyrrhenian Sea on the west.
The islands farther south in the Tyrrhenian Sea are of an entirely different character.
The Roman district, the largest of the four, extends from the hills of Albano to the frontier of Tuscany, and from the lower slopes of the Apennines to the Tyrrhenian Sea.
B~t in the time of that historian, as well as of Thucydides, the names of Oenotria and Italia, which appear to have been at that period regarded as synonymous, had been extended to include the shore of the Tarentine Gulf as far as Metapontum and from thence across to the gulfs of Laus and Posidonia on the Tyrrhenian Sea.