| Country | Spain |
|---|---|
| State | Cantabria |
| Region | Pas valley, Santander bay |
| Length | 57 km |
| Discharge1 location | mouth |
| Discharge1 avg | 18.1 m3/s (640 cu ft/s) |
| Source1 location | Castro Valnera |
| Source1 elevation | 1,200 m (3,900 ft) |
| Mouth | Ría de Mogro |
| Mouth location | Santander bay, Bay of Biscay |
| Mouth elevation | 0 m (0 ft) |
| Basin size | 649 km² |
| Tributaries left | Yera, Viaña, Magdalena, Jaral, Barcelada |
| Tributaries right | Pandillo, Pisueña |
The Pas River is located in the region of Cantabria in the northern part of Spain.[1] The river flows through the autonomous community of Cantabria and empties into the Cantabrian Sea.