| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cervo (river) |  | 22 | 1,024,000,000 | 1,868 | Sesia | 65,000 | 45.3694416667 | 8.4024027778 | Map | ||
| Sessera |  | 8 | 189,000,000 | 2,000 | Sesia | 35,461 | 45.6989700000 | 8.2973900000 | Map | ||
| Marcowefa | 160 | Sesia | 52,300 | 45.2009700000 | 8.5181400000 | Map | |||||
| Bona (torrente) |  | Sesia | 20,300 | 45.2277777778 | 8.5208333333 | Map | |||||
| Borro di Serravalle | 0 | Sesia | 10,000 |