Cwm Castell is an irregular enclosure, about 110m north-west to south-east by 54m, crowning a knoll within the cwm of Afon Feinog, between the river and a relict channel; defined by scarps except on the south, where double ramparts flank a south-east facing entrance.

(source 0S495card; SN45NE1)

RCAHMW AP965053/49-50

J.Wiles 02.10.03