| Birs | |
|---|---|
 The Birs in Laufen | |
 | |
| Location | |
| Country | Switzerland |
| Physical characteristics | |
| Mouth | Rhine |
• coordinates | 47°33′28″N 7°37′04″E / 47.5579°N 7.6177°E |
| Length | 73 km (45 mi) |
| Basin features | |
| Progression | Rhine→ North Sea |
The Birs (French: Birse) is a 73-kilometre (45 mi) long river in Switzerland that flows through the Jura region and ends as a tributary to the Rhine between Basel and Birsfelden. It is the most important river of the Swiss Jura.