Keskiniemi Light is a sector light tower located in the northwestern promontory of Hailuoto island in the

Gulf of Bothnia The Gulf of Bothnia (; fi, Pohjanlahti; sv, Bottniska viken) is divided into the Bothnian Bay and Bothnian Sea, and it is the northernmost arm of the Baltic Sea, between Finland's west coast ( East Bothnia) and the Sweden's east coast (West ...

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...

. It was built in 1908 and is located next to the

Keskiniemi beacon tower The Keskiniemi beacon tower (''Keskiniemen tunnusmajakka'' in Finnish), often referred to as the Karvo beacon tower, is a historic daymark located on a promontory of Keskiniemi in the northwestern part of Hailuoto island in the Gulf of Bothnia in ...

built in 1858. Keskiniemi Light is a square steel skeletal tower with white octagonal lantern and gallery. The focal plane of the light is 8.8 metres (29 ft) and it has a range of 6.5 nautical miles. The beacon displays a white flash every 6 seconds, visible in all directions. The tower also has a

radar reflector A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects waves directly towards the source, but translated. The three intersecting surfaces often have square shapes. Radar co ...

on the northwest side. The light is one of six lights built in 1908 to guide vessels along the fairway leading to the Port of Oulu. Originally it had an oil-burning lantern, which was replaced with a gas-burning lantern manufactured by AGA in 1941. Currently the power source is solar electricity. Originally the light was a sector light, but the coloured sectors have been removed due to the changes in shipping lanes over the years. There is an old storage shed for gas bottles next to the tower. This shed is currently unused. Keskiniemi Light is the only surviving light of those built in 1908 for the fairway leading into Oulu harbour, and with the exception of Tauvo lighthouse it is also the only steel skeletal tower still in active service as a light along the Finnish coast of the Bothnian Bay.

Sources

* * Gulf of Bothnia Hailuoto Lighthouses in Finland Buildings and structures in North Ostrobothnia {{Europe-lighthouse-stub