The Sillaro (; ; ) is a long Italian

stream A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a strea ...

, whose headwaters are by the village of Piancaldoli,

Province of Florence The province of Florence () was a Provinces of Italy, province in the northeast of Tuscany region of Italy. The city or ''comune'' of Florence was both the capital of the province of Florence, and of the Region of Tuscany. It had an area of and ...

, in

Tuscany Tuscany ( ; ) is a Regions of Italy, region in central Italy with an area of about and a population of 3,660,834 inhabitants as of 2025. The capital city is Florence. Tuscany is known for its landscapes, history, artistic legacy, and its in ...

. It runs northeast through the city of

Castel San Pietro Terme Castel San Pietro Terme ( Eastern Bolognese: ) is a ''comune'' (municipality) in the Metropolitan City of Bologna, in the Italian region of Emilia-Romagna, with about 21,000 inhabitants. It is located along the Roman '' Via Emilia'', at the foot o ...

Province of Bologna The province of Bologna () was a province in the Emilia-Romagna region of Italy. Its provincial capital was the city of Bologna. The province of Bologna covered an area of and had a total population of 1,004,323 inhabitants as of 31 December 2014 ...

, in

Emilia-Romagna Emilia-Romagna (, , both , ; or ; ) is an Regions of Italy, administrative region of northern Italy, comprising the historical regions of Emilia (region), Emilia and Romagna. Its capital is Bologna. It has an area of , and a population of 4.4 m ...

. The river runs through a short extension of the

province of Ravenna The province of Ravenna (; ) is a province in the Emilia-Romagna region of Italy. Its capital is the city of Ravenna. As of 2015, it has a population of 391,997 inhabitants over an area of , giving it a population density of 210.81 inhabitants pe ...

extending into the Province of Bologna before re-entering the Province of Bologna. It then forms the border between the

Province of Ferrara The province of Ferrara (; ) is a Provinces of Italy, province in the Italy, Italian region of Emilia-Romagna. Its capital is the city of Ferrara. As of May 2023, it has a population of 338,143 inhabitants over an area of . The province contains ...

and the Province of Ravenna for a short distance before entering the Province of Ferrara. 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. Historically, its course formed the boundary between Emilia and

Romagna Romagna () is an Italian historical region that approximately corresponds to the south-eastern portion of present-day Emilia-Romagna, in northern Italy. Etymology The name ''Romagna'' originates from the Latin name ''Romania'', which originally ...

References

External links

Rivers of the Metropolitan City of Florence Rivers of the Metropolitan City of Bologna Rivers of the Province of Ravenna Rivers of the Province of Ferrara Rivers of the Apennines Rivers of Italy {{Italy-river-stub