In this shot,can be seen the mound to the right and just beyond the tree ,the now filled in moat turning to the right.
see http://travelingluck.com/Europe/United+Kingdom/United+Kingdom+(general)/_6285854_Castell+Cynon.html#local_map
see http://www.coflein.gov.uk/en/site/304253/images/CASTELL%3BCASTELL+CYNON%2C+LAMPETER+VELFREY/
see http://www.castlefacts.info/castledetails/castleDetails3.aspx?uin=20724