| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Styx River (West Coast) |  | Kokatahi River | 16,000 | -42.8831000000 | 171.1100000000 | Map | |||||
| Toaroha River |  | Kokatahi River | 13,000 | -42.8925305556 | 171.1237527778 | Map |