Orcia

Orcia
The Orcia river at Sant'Angelo Scalo
Location
CountryItaly
RegionTuscany
MunicipalitiesRadicofani, Sarteano, Pienza, San Quirico d'Orcia, Castiglione d'Orcia, Montalcino, Castel del Piano, Cinigiano
Physical characteristics
SourcePoggio Gello (Monte Cetona)
 • locationRadicofani, Tuscany, Italy
 • coordinates42°54′46.25″N 11°50′57.42″E / 42.9128472°N 11.8492833°E / 42.9128472; 11.8492833
MouthOmbrone
 • location
Monte Antico, Tuscany, italy
 • coordinates
42°58′14.79″N 11°21′4.89″E / 42.9707750°N 11.3513583°E / 42.9707750; 11.3513583
Length57 km
Basin size798 km²
Basin features
ProgressionOmbrone → Tyrrhenian Sea

The Orcia is a river in southern Tuscany, Italy, and a major tributary of the Ombrone River. It originates on Poggio Gello on Monte Cetona, in the municipality of Radicofani, and flows from east to west through the Val d'Orcia, a cultural landscape recognised as a UNESCO World Heritage Site.

The river traverses the municipalities of Radicofani, Sarteano, Pienza, San Quirico d'Orcia, Castiglione d'Orcia, and Montalcino in the province of Siena, as well as Castel del Piano and Cinigiano in the province of Grosseto, before joining the Ombrone near Monte Antico.