
1) Animal park barriers 2) Animal park rings 3) Barriers at animal parks 4) Canals for castles 5) Castle areas 6) Castle barriers 7) Castle canals 8) Castle defenders 9) Castle defenses 10) Castle ditches 11) Castle encirclers 12) Castle fortifications 13) Castle guards 14) Castle protectors 15) Castle ringers 
Found on 
https://www.crosswordclues.com/clue/moats

1) Fosses 
Found on 
https://www.crosswordclues.com/clue/moats

ditches filled with water which surrounded a property. These are not exclusive to castles; many manor houses and farms also had moats. Initially they were for defensive purposes but later were employed for privacy and to delineate a clear property boundary. They were often stocked with fis...
Found on 
http://www.encyclo.co.uk/local/20935
  No exact match found.