The viewpoint lies within the North York Moors National Park and offers views across the edge of the moors towards the coast. Some of the bottles and litter left at Highcliff Nab in the North York Moors (Image: SUBMITTED)She said: “We were really shocked. The National Park Authority warns visitors that campfires can cause serious damage and encourages people not to light fires anywhere in the park. “This cannot be allowed in the National Park, or indeed any of our wonderful rural areas. Joel Brookfield, director of recreation and wellbeing for the North York Moors National Park Authority called the rubbish "extremely disappointing".