Castle Ring is a late 11th or early 12th century earthwork motte and bailey fortress. With commanding views of the Weald to the north and the coast to the south, it stands against the steep northern slope of the South Downs. The ditches of the castle are directly east of the boundary of the Rapes of Bramber and Lewis, which could a reason for its unusual position. The low mutilated motte is encased by a ditch and the remains of a counterscarp bank, the northern sub-rectangular bailey, is enclosed by a low rampart and ditch, with counterscarp banks to the west and south-east. The motte is flanked by two smaller northern mounds, which are probably the product of a later east to west track that was cut across the site. 4 miles west is Bramber Castle and 13 miles north-west is Knepp Castle.