Constructed into the eastern bank of a stream east of Ceunant Pen-y-rhiw is a short section of drystone revement. The wall is 4m long and 1.2m high. No other assiociated features have been identified nearby, although an adequeduct was present 150m to the north of this wall in the 19th century, which may be significant (NPRN 512544). M.Railton, NPA, 27th October 2010.