The Castellano is a river in Italy. Its source is in the

Monti della Laga Monti della Laga is a mountain range in the central Apennines of Italy. Their ruggedness and inaccessibility makes them one of the lesser known areas of the Italian peninsula. Geography The mountains run for a length of about between the Italia ...

mountains near the border between the

province of Teramo The Province of Teramo ( it, provincia di Teramo; Abruzzese: ') is a province in the Abruzzo region of Italy. Its capital is the city of Teramo. The province has an area of , a population of 313,029 (2012), and is subdivided into 47 comunes ( i ...

and the

province of Rieti The Province of Rieti ( it, Provincia di Rieti) is a province in the Lazio region of Italy. Its capital is the city of Rieti. Established in 1927, it has an area of with a total population of 157,887 people as of 2017. There are 73 ''comuni'' ...

north of

Monte Gorzano Monte Gorzano is the highest peak in the Monti della Laga, in northern Abruzzo, central Italy. It has an elevation of and is also the highest peak of Lazio. It is located on the boundary with the provinces of Teramo in the Abruzzo region and ...

. It flows northeast through the mountains in the province of Teramo and eventually forms the border between the province of Teramo and the

province of Ascoli Piceno The province of Ascoli Piceno ( it, Provincia di Ascoli Piceno) is a province in the Marche region of Italy. Its capital is the city of Ascoli Piceno, and the province is bordered by the Adriatic Sea to the east, the Province of Fermo to the north ...

. The river flows west of Monte dei Fiori before entering the province of Ascoli Piceno. The river joins the

Tronto The Tronto ( la, Truentus) is a long Italian river that arises at Monti della Laga and ends in the Adriatic Sea at Porto d'Ascoli, San Benedetto del Tronto. It traverses the Lazio, Marche, and Abruzzo regions of Italy. The source of the Tronto i ...

Ascoli Piceno Ascoli Piceno (; la, Asculum; dialetto ascolano: Ascule) is a town and ''comune'' in the Marche region of Italy, capital of the province of the same name. Its population is around 46,000 but the urban area of the city has more than 93,000. Geo ...

References

Rivers of the Province of Ascoli Piceno Rivers of the Province of Teramo Rivers of Italy Adriatic Italian coast basins {{Italy-river-stub