A woman who spent four days lost in a national park in eastern Victoria has been rescued after writing "help" in the sand of a riverbank.

Local police found a four-wheel-drive belonging to Lynette Joyce Bond on the Deddick Trail in the Snowy River National Park near the New South Wales border on Saturday.

A note left with the car said it had broken down on Wednesday.

Police search and rescue crews and volunteer bushwalkers took part in a search for the 68-year-old, which ended before midday yesterday when she was spotted by the Victoria Police airwing.

Police say Ms Bond had written "help" in the sand on the banks of the Snowy River.

Ms Bond, from Mornington south-east of Melbourne, was winched to safety.

She has been taken to hospital for a check-up but is believed to be in good health.

Police, SES volunteers and volunteer bushwalkers helped search for the woman.