The Arbia is a torrent in Tuscany, central Italy, a tributary of the Ombrone river. Its source is located in the commune of Castellina in Chianti, at 620 m above sea level. It flows into the Ombrone near the town of Buonconvento. The river is mentioned by Dante in his Divine Comedy who wrote ‘its waters becoming stained red’ (Inferno, Canto X, verse 86) in the wake of the Battle of Montaperti in 1260 between Florence and Siena. Localities taking their names from Arbia include the comune of Monteroni d’Arbia and the frazioni of Isola d’Arbia, Taverne d’Arbia (both in the comune of Siena) and Arbia (Asciano) (comune of Asciano).