Grønfjellåga
| Grønfjellåga | |
|---|---|
| Location | |
| Country | Norway |
| County | Nordland |
| Municipalities | Rana Municipality |
| Physical characteristics | |
| Source | Kopparvassdalen valley |
| • location | Rana Municipality, Norway |
| • coordinates | 66°19′59″N 14°52′18″E / 66.333026°N 14.871733°E |
| • elevation | 440 metres (1,440 ft) |
| Mouth | Ranelva river |
• location | Nevernes, Rana Municipality |
• coordinates | 66°22′24″N 14°35′33″E / 66.37332°N 14.592397°E |
• elevation | 83 metres (272 ft) |
| Length | 17 km (11 mi) |
Grønfjellåga (lit. 'green mountain river') is a river in Rana Municipality in Nordland county, Norway. The 17-kilometre (11 mi) long river's source is the lakes Kallvatnet and Kopparvatnet. It then flows through the Grønfjelldalen valley while absorbing several smaller rivers, before it flows out as a tributary to the river Ranelva at the Dunderforsen waterfall (also called Stupforsen).