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|- location||San Gusmé, Monti del Chianti|
|- elevation||about 420 m (1,380 ft)|
|Length||160 km (99 mi)|
|Basin size||3,494 km2 (1,349 sq mi)|
|- average||32 m3/s (1,100 cu ft/s) at the mouth|
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.