| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Poplar Rapids River | Mattagami River | 49.5791666667 | -81.7972222222 | Map | |||||||
| Groundhog River | Mattagami River | 210,000 | 49.7178000000 | -81.9678000000 | Map | ||||||
| Kapuskasing River |  | Mattagami River | 180,000 | 49.8086000000 | -82.0028000000 | Map | |||||
| Gardiner River | Mattagami River | 50.6977777800 | -81.5300000000 | Map |