The Sillaro river is a 66 km-long Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 stream

Stream

A stream is a body of water with a current, confined within a bed and stream banks. Depending on its locale or certain characteristics, a stream may be referred to as a branch, brook, beck, burn, creek, "crick", gill , kill, lick, rill, river, syke, bayou, rivulet, streamage, wash, run or...

, whose headwaters are by the village of Piancaldoli (Firenzuola, Firenze), in Tuscany

Tuscany

Tuscany is a region in Italy. It has an area of about 23,000 square kilometres and a population of about 3.75 million inhabitants. The regional capital is Florence ....

. It runs northeast through the city of Castel San Pietro Terme

Castel San Pietro Terme

Castel San Pietro Terme is a small city and comune in the province of Bologna, Emilia-Romagna, Italy, with about 20,600 inhabitants. It is located along the Roman Via Aemilia, at the foot of the Tosco-Emilian Appennines....

, Province of Bologna

Province of Bologna

The Province of Bologna is a province in the Emilia-Romagna region of Italy. Its capital is the city of Bologna.-Geography:It has an area of 3,702 km², and a total population of 991,647 . There are 60 comuni in the province, see Comuni of the Province of Bologna...

 in Emilia Romagna and ends as a tributary of the Reno River

Reno River

The Reno is a river of Emilia-Romagna, northern Italy. It is the tenth longest river in Italy and the most important of the region apart from the Po...

 by the village of San Biagio di Argenta

Argenta

-Places:Canada* Argenta, British Columbia, a community in the Regional District of Central KootenayItaly* Argenta, Emilia–Romagna, a town in the Province of FerraraUnited States* Argenta, Illinois, a village in Macon County-Other uses:...

, Province of Ferrara

Province of Ferrara

The Province of Ferrara is a province in the Emilia-Romagna region of Italy. Its capital is the city of Ferrara.It has an area of 2,632 km², about two thirds of the area of the U.S. State of Rhode Island, and a total population of about 350,000 . There are 26 comuni in the province , see...

. Historically its course formed the boundary between Emilia

Emilia (region of Italy)

Emilia is a historical region of northern Italy which approximately corresponds to the western and north-eastern portions of today’s Emilia-Romagna region...

 and Romagna

Romagna

Romagna is an Italian historical region that approximately corresponds to the south-eastern portion of present-day Emilia-Romagna. Traditionally, it is limited by the Apennines to the south-west, the Adriatic to the east, and the rivers Reno and Sillaro to the north and west...

.