| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Brzozówka (rzeka) |  | Biebrza | 38,000 | 53.5806730000 | 22.9321030000 | Map | |||||
| Ełk (Fluss) |  | 1,524,499,968 | Biebrza | 113,600 | 53.5050000000 | 22.6502777800 | Map | ||||
| Netta (river) |  | 1,336,000,000 | Biebrza | 20,000 | 53.6097222200 | 22.9319444400 | Map | ||||
| Rospuda |  | Biebrza | 80,000 | 53.9076000000 | 22.9110000000 | Map |