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Santerno
The Santerno is a river in Romagna〔Although its first kilometers are geographically in the Tuscany region.〕 in northern Italy. It is the major tributary of the Reno River. In Roman times, it was known as the ''Vatrenus'' (small ''Renus''), although, in the Tabula Peutingeriana, it was already identified as the ''Santernus''.
It rises near the Futa Pass, at 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 (the Po River's valley), 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, from Bastia.
It is probable that, in ancient times, the river flowed eastward from Bagnacavallo, as confirmed be the existence of a ''frazione'' of Ravenna called Santerno. In those days, after Imola, the river divided into two branches, one moving northeast toward Ravenna, the other continuing northward to join the Po. The Ravenna branch disappeared, most likely in the eighth century.
Once the late course of the river was modified, and protective measures were taken in the 1880s, the Santerno was famous for its serious floods. Fourteen were recorded between 1679 and 1778.
==Footnotes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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