| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Marillet (Lay) | Lay | 29,000 | 46.5347222200 | -1.2319444400 | Map | ||||||
| Petit Lay |  | 341,000,000 | Lay | 58,100 | 46.6277777800 | -1.0780555600 | Map | ||||
| Graon | La Boissière-des-Landes | Lay | 17,800 | 46.5770000000 | -1.4260000000 | Map | |||||
| Smagne |  | 212,000,000 | Lay | 50,300 | 46.5369444400 | -1.2041666700 | Map | ||||
| Loing (affluent du Lay) | 123,000,000 | 166 | Lay | 27,000 | 46.6719444400 | -0.9836111100 | Map |