The Chiana ( Canale maestro della Chiana ) at Castroncello (village of Castiglion Fiorentino)

The Chiana [ kja ː na ] (antique Clanis, also Chiani ) is an approximately 42 km long river in the Italian regions of Tuscany and Umbria.


The river rises in the Apennines of Arezzo ( Arezzo ) and initially flows south through the valley of Chiusi ( Siena ). He then leaves the Tuscany and Umbria enters. Here he happened Città della Pieve ( Perugia Province ), where in the Ponticelli district of Torrente Astrone flows in from the right. He then enters the municipality of Fabro ( Province of Terni ) and flows further south to Ficulle, where he first briefly acts as a northern border with Montegabbione and then in the Eastern Township area serves as a boundary to Parrano. In Orvieto, he first crossed the Ponte di Ferro and then flows between Ciconia and Orvieto Scalo the Paglia from left to. Together with him, he opens a few miles later into the Tiber.


The river changed its course several times in its history. First, it flowed to the Arno, then, at the time of the Etruscans, he ended up as a tributary of the Tiber, where he crossed the Lake Trasimeno. He often caused historically significant flooding in the valley of Clusium ( Chiusi ), which were felt as far away as Rome. In 15 it was proposed to divert a portion of the water of the Chiana in the Arnus ( Arno). This project was abandoned due to opposition by the Florentines ( Tacitus, Ann I. 79).

In the Middle Ages the whole valley between Arezzo and Chiusi was an uninhabitable swamp; but towards the end of the 18th century, the engineer Conte Fossombroni took the matter in hand and moved the watershed around 25 km further south, so that the water now flows partly through the Canale maestro della Chiana into the Arno, and partly into the Tiber.

Canale maestro della Chiana

The channel is formed near the lake Lago di Chiusi and initially flows through the lake Lago di Montepulciano in the eastern municipality of Montepulciano. He now flows north between the municipalities Torrita di Siena and Sinalunga (both province of Siena ) and Cortona, Foiano della Chiana and Marciano della Chiana (all Arezzo Province). In the western municipality of Castiglion Fiorentino enters from the right of the Torrente Esse one. Continue north fluent he is now the border of Monte San Savino and Civitella in Val di Chiana with the provincial capital of Arezzo. This wraps around the west channel. In the northwest of Arezzo comes from the right of the 14 km long Torrente Castro added, together they lead a short time later as a left tributary of the Arno. The Canale maestro della Chiana lays back to go there 51 km.

Valdichiana ( Chiana Valley )

The Chiana Valley (Val di Chiana / Valdichiana ) comprises 23 municipalities, which are divided into different sub-zones.

Val di Chiana aretina

The Val di Chiana aretina includes the communes of Arezzo, Castiglion Fiorentino, Civitella in Val di Chiana, Cortona, Foiano della Chiana, Lucignano, Marciano della Chiana and Monte San Savino. All municipalities are located in the province of Arezzo (Tuscany ), where Lucignano and Monte San Savino does not lie directly on the river or channel.

Val di Chiana Senese

The Val di Chiana Senese ' includes the municipalities of Cetona, Chianciano Terme, Chiusi, Montepulciano, San Casciano dei Bagni, Sarteano, Sinalunga, Torrita di Siena and Trequanda. All municipalities are located in the province of Siena (Tuscany ), where Chianciano Terme, Sarteano and Trequanda are not right on the river or channel.

Val di Chiana romana

The Val di Chiana romana includes the municipalities of Castiglione del Lago, Passignano sul Trasimeno, Panicale, Paciano, Città della Pieve (all Province Perugia) and Monteleone d' Orvieto and Fabro (Province of Terni ), where Castiglione del Lago, Monteleone d' Orvieto, Paciano, Panicale and Passignano sul Trasimeno (no longer) are right on the river or channel.