| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Río Gualjaina | Chubut Province | 200,000 | -42.6133500000 | -70.3847500000 | Map | ||||||
| Chico River (Lower Chubut) |  | Chubut Province | 300,000 | ||||||||
| Chico River (Upper Chubut) |  | Chubut Province | 160,000 | ||||||||
| Tecka River |  | Chubut Province | 200,000 | -43.0561200000 | -70.7904800000 | Map |