|Surface area||12.42 km2 (4.80 sq mi)|
|Max. depth||12.81 m (42.0 ft)|
|Surface elevation||40.5 metres (133 ft)|
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 a one of the National landscapes of Finland. The area has been inhabited continuously since the Iron Age.
Kirkkosaari is another and much larger island. First church was built there in the 15th century, the present church dates back to 1752.
- Media related to Lake Köyliönjärvi at Wikimedia Commons
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