Cetona is a town and comune in the southern part province of Siena, Tuscany, in an area where Umbria and Lazio meet. It is one of I Borg…Cetona is a town and comune in the southern part province of Siena, Tuscany, in an area where Umbria and Lazio meet. It is one of I Borghi più belli d'Italia. The geographical elevation is between 250 metres and the 1,148 metres of Monte Cetona itself, at the base of which the town is situated at around 350 metres.