The Ontario Provincial Police say crews are searching for a 22-year-old woman from Scarborough who went missing in the Papineau Lake waters in Hastings Highlands on Saturday evening.
Officers from the Bancroft detachment responded to the incident just before 8 p.m.
Police said a woman had fallen off a floating device while she was in the water, and did not make it back to shore.
An area search commenced with the assistance of the OPP Emergency Response Team.
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The searched resumed Sunday with the help of the Underwater Search and Recovery Unit.
The news comes as OPP continues to search for an 8-year-old boy who went missing in Lake Erie from Turkey Point on Saturday afternoon.