Vetulonia, formerly called Vetulonium (Etruscan Vatluna), was an ancient town of Etruria, Italy, the site of which is probably occupied by the modern village of Vetulonia, which up to 1887 bore the name of Colonnata and Colonna di Buriano: the site is currently a frazione of the comune of Castiglione della Pescaia, with some 400 inhabitants.