 The ridge is above sea level at its highest point and it is possible to view King Alfred's Tower, Cranmore Tower, the Black Mountains and Glastonbury Tor on clear days.The hill is the site of the Long Knoll biological Site of Special Scientific Interest, which was notified in 1971, and is part of the Cranborne Chase and West Wiltshire Downs Area of Outstanding Natural Beauty.Long Knoll is the most westerly part of the remains of a chalk plateau.