| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Odon (river) |  | 216,000,000 | 275 | Orne | 47,000 | 49.1613888889 | -0.3702777778 | Map | |||
| Rouvre |  | 309,000,000 | 313 | Orne | 42,000 | 48.8469444400 | -0.3838888900 | Map | |||
| Thouanne | 52,000,000 | 378 | Orne | 17,700 | |||||||
| Udon | 132,000,000 | 305 | Orne | 28,300 | 48.7177777800 | -0.1322222200 | Map | ||||
| Ure |  | 539,000,000 | 248 | Orne | 30,200 | 48.7347222200 | -0.0083333300 | Map |