Köyliönjärvi
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.