A woman had to be airlifted to Toronto, Ont after she was seriously injured Sunday afternoon while water tubing in Muskoka.

OPP say it happened on Muldrew lake off Browns Way near Gravenhurst, Ont. when a pleasure craft made a turn and the tube it was towing exited the wake at a high rate of speed, striking a rock face.

The 19-year-old woman was airlifted by Ornge to Sunnybrook Hospital in Toronto Sunday afternoon in serious condition.

Officials are investigating.