| Sira | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Agder/Rogaland |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Flekkefjord, Sirdal, Sokndal, Lund |
| Length: | 152km (94miles) |
| Discharge1 Avg: | 130m3/s |
| Source1: | Sirdalsheiane, Ytre Storevatnet |
| Source1 Location: | Bykle, Agder, Norway |
| Source1 Coordinates: | 59.2764°N 6.9111°W |
| Source1 Elevation: | 1000m (3,000feet) |
| Mouth: | Åna |
| Mouth Location: | Åna-Sira, Rogaland-Agder, Norway |
| Mouth Coordinates: | 58.2922°N 6.44°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 1902.7km2 |
Sira is a river in southwestern Norway. The 152km (94miles) long river flows begins in the Sirdalsheiane mountains near the borders of Agder and Rogaland counties. The headwaters of the river is the lake Ytre Storevatnet and it flows south through the Sirdalen valley in the municipalities of Sirdal and Flekkefjord. The river flows through the large lakes Sirdalsvatnet and Lundevatnet before heading south on the Agder/Rogaland county border. At the village of Åna-Sira the river empties into the Åna fjord. The river runs through several large villages such as Åna-Sira, Sira, Tonstad, Lunde, and Kvæven. The river drains the 1902.7km2 watershed. The Tonstad Hydroelectric Power Station is powered by water from the waterfalls along this river.[1]