The Santerno is a river in Romagna in northern Italy. It is the major tributary of the Reno River. In Roman times, it was known as the Vatrenus , although, in the Tabula Peutingeriana, it was already identified as the Santernus.
It rises near the Futa Pass, at 1,222 metres of elevation, in the Apennine ridges facing the plateau of Firenzuola in the province of Florence. Beyond Firenzuola, it flows northeast through the province of Bologna near Castel del Rio, where it is crossed by a famous medieval bridge, the Ponte degli Alidosi. It then flows past Fontanelice, Borgo Tossignano, Casalfiumanese, and, once in the Pianura Padana , Imola. The river forms the border between the province of Bologna and the province of Ravenna for a distance before entering the province of Ravenna. It then empties into the Reno, 7 kilometres from Bastia.
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