| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Paraná River |  | 18 | 2,582,672,048,128 | 323 | Río de la Plata | 2,570,000 | -20.0850000000 | -51.0006000000 | Map | ||
| Santa Lucía River |  | 14,200,000,512 | 250 | Río de la Plata | 248,000 | -34.7852777778 | -56.3586111111 | Map | |||
| Uruguay River |  | 4,622 | 364,999,999,488 | 1,800 | Río de la Plata | 1,500,000 | -27.6083333333 | -51.4558333333 | Map | ||
| Arroyo Riachuelo (Uruguay) |  | Río de la Plata | 17,000 | -34.4561111100 | -57.7347222200 | Map | |||||
| Río Santiago (Buenos Aires) |  | Río de la Plata | -34.8483000000 | -57.8872000000 | Map |