The substantial (67 kilometers long) river valley that divides North Etruria from South Etruria and formed an important political frontier during Etruscan times. The valley is traditionally considered to have been dominated by the city of Vulci, but this city was sufficiently distant to allow the development of a number of independent small (Marsiliana d’Albegna, Orbetello, Saturnia, Talamone, Ghiaccio Forte) and dependent large (La Doganella) political settlements at different stages in the sociopolitical sequence. The valley has recently been extensively surveyed as part of a project focused on the classical landscape.
Historical Dictionary of the Etruscans. Simon K. F. Stoddart.