Boating accident being investigated. Photo: Damian White

A teenage girl has lost most of her left leg in a wakeboarding accident in northern Victoria on Friday night.

The 15-year-old was boarding behind a power boat on the Murray River when the boat changed direction while towing her. She fell off her board and became caught up in the power boat's propeller, severing her left leg above the knee.

She was airlifted from the river near Bundalong east of Yarrawonga shortly after 8.30pm and taken to Melbourne Royal Children's Hospital, where a spokeswoman on Saturday said she was in a critical condition.

Police seized the boat for mechanical inspection and have interviewed the 45-year-old operator.

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