Rotorua's Department of Conservation branch says it will have to spend thousands of dollars to remove about a dozen wrecked cars and secure and repair a scenic reserve.
DoC Rotorua acting senior ranger Jo Mendonca said a ranger recently found about eight wrecked cars and evidence of people driving their cars into the Patetere Scenic Reserve on Cecil Rd near Mamaku and doing "donuts" and illegally taking firewood from the area.
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Miss Mendonca said the cars had been moved from within the reserve so they could be taken away, but since then people had dumped about another four vehicles next to them.
She said the cost to remove the cars, the laying of new roading metal and new signage for the reserve would run into the thousands of dollars.