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| Location | Vikna, Nord-Trøndelag, Norway |
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| Coordinates | |
| Year first lit | 1904 |
| Automated | 1987 |
| Markings / pattern | White with red tower |
| Height | 19 metres (62 ft) |
| Focal height | 23 metres (75 ft) |
| Range | 12.5 nmi (23.2 km; 14.4 mi) |
| Characteristic | Oc WRG 6s |
Grinna Lighthouse (Norwegian: Grinna fyr) is a coastal lighthouse in the municipality of Vikna in Nord-Trøndelag, Norway. It was established in 1904 and automated in 1987.[1] Grinna lighthouse stands on the islet of Grinna in the South Gjæslingan island group on the north side of the Foldafjord. The 19-metre (62 ft) high red tower emits a light every six seconds. The white occulting light flashes every six seconds, and it can be seen for about 12.5 nautical miles (23.2 km; 14.4 mi).[2][3]