The eastern defences of Dover Castle facing a higher area of chalk downland, form an important aspect of the castle’s defences and are largely medieval in origin, although greatly altered in the 18th and 19th centuries. The Avranches Flank, located between Avranches Tower and the former site of Pencester Tower, is a remarkable survival of part of a sophisticated 12th-century defensive system. (location accurate to the nearest 1m based on available information)