The Sillaro (Latin Silarus, Emilian Sàrrel, Romagnol Sélar) is a 66-kilometre (41 mi) long Italian stream, whose headwaters are by the village of Piancaldoli (Firenzuola, province of Florence), in Tuscany.

It runs northeast through the city of Castel San Pietro Terme, Province of Bologna in Emilia Romagna.

[1] The river ends as a tributary of the Reno River by the village of San Biagio di Argenta and near where the Idice enters the Reno.

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