| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| River Rhondda |  | River Taff | 5,000 | 51.6159000000 | -3.4107400000 | Map | |||||
| River Cynon |  | River Taff | 51.6333000000 | -3.4833300000 | Map |