Castelnuovo Berardenga is a comune (municipality) in the Province of Siena in the Italian region Tuscany, located about 50 km southeast of Florence and about 14 km east of Siena. As of 31 December 2004, it had a population of 8,013 and an area of 177.0 km2.
The municipality of Castelnuovo Berardenga contains the frazione (subdivision) Montaperti.
Castelnuovo Berardenga borders the following municipalities: Asciano, Bucine, Castellina in Chianti, Gaiole in Chianti, Monteriggioni, Radda in Chianti, Rapolano Terme, Siena.
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