Named for the three small rivers that converge on the property, I Tre Borri is Corzano's most profound and generous wine. It is pure Sangiovese from three parcels of the estate's oldest vines, 1970, and cropped at roughly one bottle per vine. It is made only in the finest vintages.
Since 2015 it has been bottled as Toscana Rosso rather than Chianti Riserva. Aljoschia Goldschmidt felt the Riserva DOCG image was in decline and preferred the IGT designation to convey the quality and philosophy of a wine made from the cream of Corzano's Sangiovese.