Paasselkä devils () are light phenomena sometimes appearing at Lake Paasselkä,

Finland Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bothnia to the west and the Gulf of Finland to the south, ...

and swampy and forested areas nearby the lake. Paasselkä is a lake formed in an

impact crater An impact crater is a depression (geology), depression in the surface of a solid astronomical body formed by the hypervelocity impact event, impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal c ...

. There is a

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in the centre of the lake. The Paasselkä Devil is usually said to be a ball of light visible in the air above Paasselkä or areas nearby. It is said to move at varying speeds on some occasions and to remain stationary at others. Sometimes there are several balls. The "ball of fire" has been said by some locals to act as if it were conscious. It can follow fishermen's boats or escape the light of torch. Sometimes the light moves at incredible speeds. The light has been visible for a long time; it is a part of local

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and was given the name "devil". Locals in earlier times may have believed that the ball of light was actually an evil creature. In earlier times local people were used to seeing these lights and did not consider them to be something extraordinary. The lights are still observed occasionally, and have been caught on film and photographed. This light phenomenon became more widely known through a 2006 book by Sulo Strömberg containing stories about the phenomenon.

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