| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Robo | Biurrun olcoz | Arga | 13,000 | 42.6966399695 | -1.6914891305 | Map | |||||
| Río Araquil |  | Arga | 42.9167000000 | -1.9666700000 | Map | ||||||
| Río Elorz |  | Izco | Arga | 35,000 | 42.8011111100 | -1.7025000000 | Map | ||||
| Río Ulzama |  | Arga | 36,000 | 42.8333300000 | -1.6666700000 | Map |