The office of the chief coroner has determined that Delaine Copenace drowned.
The 16-year-old's remains were discovered Tuesday morning in the Lake of the Woods at the edge of Kenora.
The First Nations girl ad been the subject of an extensive missing person's search for the last three weeks.
Municipal workers found her body in the water.
Delaine was last seen in downtown Kenora on the night of Feb. 27 and her family reported her missing the next day.
Relatives on Facebook posted that she had gone for a walk with friends and it was out of character for the shy girl not to return home.
The police search grew to include the Canadian Centre for Child Protection and a large number of community volunteers. It also stretched 200 kilometres west to Winnipeg, where Delaine had family and often visited.
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