see http://www.castlefacts.info/contentpages/castledetails/castledetails.asp?country=Wales&countyid=62&county=Pembrokeshire&castleid=5985&latitude=51.7715492248535&longitude=-4.73943996429443&uin=20808 see http://www.templetonheritagegroup.org.uk/sentencecastle.html Recent thoughts on this very wet,wide section of the moat,is that it is probably a silted up fish pond.