Just north of Leighton Moss is the gentle hill of Trowbarrow and quarrying was carried out on the west-facing slope. This has left cliff faces rising as high as 165ft which rock climbers have used for many years and there are several nationally important routes. Even mountain bikers have found the quarry bed a challenge but are welcomed because they play an important role in keeping parts of these areas 'open' to the benefit of certain flowers and insects. The whole quarry exhibits natural features which have contributed to it being designated as a Site of Special Scientific Interest (SSSI), a Biological Heritage Site and a Local Nature Reserve. In addition, Limestone Pavement Orders cover limestone pavement and scars.