| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rio Guaricanga | Iapó River | ||||||||||
| Cunhaporanga River | Iapó River | -24.7106664000 | -49.9082302000 | Map | |||||||
| Fortaleza River | Iapó River | -24.4817210000 | -50.3736036000 | Map | |||||||
| Piraí River (Paraná) |  | Iapó River | -24.7524713000 | -50.0867231000 | Map | ||||||
| Piraí-Mirim River | Iapó River | -24.6861000000 | -50.1469000000 | Map |