The hills run from the Vale of Taunton Deane in the south, for about to the north-west, ending at Kilve and West Quantoxhead on the coast of the Bristol Channel. They form the western border of Sedgemoor and the Somerset Levels. From the top of the hills on a clear day, it is possible to see Glastonbury Tor and the Mendips to the east, Wales as far as the Gower Peninsula to the north, the Brendon Hills and Exmoor to the west, and the Blackdown Hills to the south. The highest point on the Quantocks is Wills Neck, at . Soil types and weather combine to support the hills' plants and animals. In 1970, an area of was designated as a Biological Site of Special Scientific Interest.