| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Bormida (river) |  | 44 | 2,608,999,936 | 800 | Tanaro | 153,000 | 44.9343190000 | 8.6750110000 | Map | ||
| Canale Carlo Alberto | 4 | Tanaro | 21,500 | ||||||||
| Corsaglia |  | 10 | 307,980,000 | 2,030 | Tanaro | 34,000 | 44.4173100000 | 7.9612500000 | Map | ||
| Ellero |  | 5 | 197,450,000 | Tanaro | 34,600 | 44.4430555600 | 7.8852777800 | Map | |||
| Pesio |  | Tanaro | 43,000 | 44.4663888900 | 7.8886111100 | Map |