| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Bléquin | 67,000,000 | 129 | Aa | 13,200 | |||||||
| Hem (rivière) |  | 105,000,000 | Escœuilles | Aa | 24,500 | 50.7261111111 | 1.9263888889 | Map | |||
| Houlle |  | 105,000,000 | 13 | Aa | 4,800 |