| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Arbia |  | 4 | Ombrone | 57,000 | 43.1379310000 | 11.4749410000 | Map | ||||
| Lanzo |  | Ombrone | 29,000 | 42.9280000000 | 11.2760000000 | Map | |||||
| Merse (river) |  | 15 | Ombrone | 70,000 | 43.0761111100 | 11.3663333300 | Map | ||||
| Orcia |  | 12 | Ombrone | 57,000 | 42.9709000000 | 11.3501210000 | Map | ||||
| Trasubbie | Ombrone | 24,000 | 42.8000000000 | 11.2333333333 | Map |