A motorcyclist suffered back and head injuries and lost teeth after falling almost 7m from a makeshift jump in Canunda National Park on Saturday.

The alarm was raised at 9.30am and emergency crews headed to the crash site near the Cape Banks automatic lighthouse.

The 26-year-old Paringa man was treated at the accident scene by paramedics from the SA Ambulance Service.

He was then transported by ambulance to Mount Gambier Hospital for treatment of his injuries which are not considered to be life-threatening.