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Köyliönjärvi panorama.jpg
Location Köyliö, Finland
Coordinates 61°08′14″N 022°19′36″E / 61.13722°N 22.32667°E / 61.13722; 22.32667Coordinates: 61°08′14″N 022°19′36″E / 61.13722°N 22.32667°E / 61.13722; 22.32667
Primary outflows Köyliönjoki[1]
Basin countries Finland
Surface area 12.42 km2 (4.80 sq mi)[2]
Max. depth 12.81 m (42.0 ft)[1]
Surface elevation 40.5 metres (133 ft)[2]
Islands 4[1]
Settlements Köyliö
References [1][2]

Köyliönjärvi (Lake Köyliö, Swedish: Kjulo träsk) is a lake in the municipality of Köyliö, Finland.

Lake Köyliö is the home of the first documented historical event in Finland as Saint Henry was allegedly murdered on the ice of the lake in 1156. The lake and its surroundings are classified as one of the National landscapes of Finland. The area has been inhabited continuously since the Iron Age.[3]


Kirkkokari Island is located near the murder site of Saint Henry. It used to be a Medieval pilgrimage site for Roman Catholics.

Kirkkosaari is another and much larger island. First church was built there in the 15th century, the present church dates back to 1752.


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