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 A HISTORY OF SUFFOLK on the isthmus of a small peninsula formed by the windings of the River Waveney, and covered the ford at this point. The later mediaeval adapta- tions for the I 3th-century castle of Roger Bigod greatly altered the original features of the artificial earthen mount. The latter is supported all around by a perpendicular w^all of flint which, on the east, is 20 ft. high ; this is reduced by the rising of the ground to 18 ft. on the north and 9 ft. 6 in. on the west, with the greater height of i 2 ft. on the south, increasing towards the east. Between the two flanking towers of the entrance the height is 6 ft. The middle of the mount sustains the ruins of a shell keep within which is a well ; around the edge of the flint-built mount another shell surrounded the first, and between the two are two shafts descending into a subterranean chamber 14 ft. square and 14 ft. high. On the south and south- west of the mount are the massive remains of the vallum formerly surrounding SCALC OF reCT O 100 ZOO 300 i I I I Clare Castli 594