Lincolnshire Police and English Nature are taking action against quad bikers who are causing irreparable damage to protected sites across the county.
English Nature has sent out 40 warning letters to quad bike owners who have been using their vehicles on sites of special scientific interest (SSSIs).
They warn repeat offenders risk a court appearance and a £20,000 fine.
The latest site for concern is Gibraltar Point, from the boat compound at South Parade in Skegness.
'Destructive activity'
Pc Nigel Lound, wildlife crime officer, said the area of concern is mainly saltmarsh and an endangered habitat.
He said: "The area also includes dunes and the entire stretch is home to many breeding birds. In addition it provides a rich variety of flora and fauna, including insects, plants and flowers and other unique and beautiful British wildlife.
"We have wardens in the area and through them and responsible reporting by members of the public we hope to put a stop to this unnecessary and destructive activity."
Police said quad biking on SSSIs is a constant problem, with riders ignoring signs in car parks warning them against the activity. Lincolnshire has 100 of England's 4,100 SSSIs.
At Gibraltar Point, the Lincolnshire Wildlife Trust provides information from the scene to help tackle the problem.
Kev Wilson, site manager at Gibraltar Point, said: "We are grateful to local residents and others who visit the area for quiet enjoyment, for recording details of quad bikers and other off road users."