Isola d'Arbia is a village in Tuscany, central Italy, administratively a frazione of the comune of Siena, province of Siena. At the time of the 2001 census its population was 909. Popolazione residente - Siena (dettaglio loc. abitate) - Censimento 2001 , Istat.
Isola d'Arbia is about 10 km from Siena.
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