Wikipedia
The Ombrone (Latin: Umbro) is a long river in Tuscany, central Italy.
The Ombrone's source is near Castelnuovo Berardenga, on the south-eastern side of the Monti del Chianti. After a twisting route, it receives the waters of the tributaries Arbia, Merse and Orcia before reaching the plain near Istia d'Ombrone.
It subsequently passes near the city of Grosseto, before flowing into the Tyrrhenian Sea.
Ombrone was a department of the First French Empire in modern-day Italy. It was named after the river Ombrone. It was formed in 1808, when the Kingdom of Etruria (formerly the Grand Duchy of Tuscany) was annexed directly to France. Its capital was Siena.
The department was disbanded after the defeat of Napoleon in 1814. At the Congress of Vienna, the Grand Duchy of Tuscany was restored to its previous Habsburg-Lorraine prince, Ferdinand III. Its territory is now divided between the Italian provinces of Siena, Arezzo and Grosseto.