| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| River Lyd, Devon |  | River Tamar | 50.6319444444 | -4.1200000000 | Map | ||||||
| River Inny, Cornwall |  | Davidstow | River Tamar | 32,187 | 50.5784000000 | -4.2898200000 | Map | ||||
| River Tavy |  | River Tamar | 50.4666666667 | -4.1500000000 | Map | ||||||
| River Ottery |  | 124,500,000 | Otterham | River Tamar | 33,000 | 50.6576980000 | -4.3388000000 | Map |