Petroio is a village in Tuscany, central Italy, administratively a frazione of the comune of Trequanda, province of Siena. At the time of the 2001 census its population was 335.[1]

CountryItaly
Elevation447 m (1,467 ft) Quick facts Country, Region ...
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Petroio is about 50 km from Siena and 7 km from Trequanda.