Anglo-Normans constructed square or rectangular enclosures called moated sites.
Moated sites consist of one or more ditches, which in most cases were intended to be water-filled,
surrounding an area occupied by buildings or other structures. The earth created by digging the moat was
often piled into the area enclosed by it to form a raised platform on which buildings were constructed.
The size and shape of the area enclosed by the moat varies.
This is the moated remains of Castlereagh castle.