Once home to powerful chieftains, a historic Perthshire landmark has become a playground for irresponsible motorcyclists.
Significant damage has been caused to parts of Moncreiffe Hill, which boasts two iron age hill forts.
Tracks from off-road motorbikes have been found on Moredun Top and there are fears the ancient monument could be ruined.
The Woodland Trust Scotland has received a number of complaints about people using the hill as a track.
Site manager Jill Aitken said: “We’ve had reports from walkers that the dirt bikes have passed them at high speed, giving them a big fright.
“All of our woods are open to the public and we welcome walkers, cyclists and horse riders.
“However, we can’t allow access to motorbikes because they cause damage to the paths and the noise spoils other people’s enjoyment of the wood.”
Although the charity, which leads woodland conservation efforts across the country, has installed signs advising locals and visitors that motorbikes are prohibited, these have been completely ignored.
In a bid to preserve the unique history of Moncreiffe Hill, trust has now reported the matter to the police.
Ms Aitken added: “If this irresponsible activity continues, it’s just a matter of time before there’s an accident.”
Anyone with any information on the off-road biking on Moncreiffe Hill is asked to contact Police Scotland by calling the non-emergency number, 101.
Believed to be a former seat of power, Moredun Top will be the focus of excavations by Perth and Kinross Heritage Trust later this year.
During the Iron Age, thick stone walls crowned the hill and gave the chieftain commanding views of the surrounding landscape.
The stronghold would have been ideal for security and defence, offering clear lines of sight of approach by land or water, as well as providing security.
The site would also have allowed for easy exploitation of the natural resources offered by the river Tay and the surrounding land.
While small farms and settlements may have surrounded the hill, the oval citadel on the summit was surrounded by a larger walled courtyard that would have provided protection for some of the chieftain’s most valuable subjects, such as smiths and other craftspeople.