Outlook RCMP are looking for a missing man who may have drowned in Lake Diefenbaker.

RCMP received a call on Thursday from a woman who was swimming in the lake.

She made it back to shore, but could not locate the 35-year-old man in the water or on the shore. He was last seen in the area of Danielson Provincial Park.

RCMP, Saskatchewan Ministry of Environment, Civil Air Search and Rescue Association, Outlook Fire Department and members of the public have begun searching the lake and shoreline by boat, ground and air.