| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Czerna Mesta | 1 | 164,000,000 | Rila | Nestos | 23,300 | 42.0353000000 | 23.7103000000 | Map | |||
| Dospat (river) |  | 633,500,032 | 1,610 | Nestos | 110,000 | 41.3903000000 | 24.0875000000 | Map |