a moat that is a wide ditch filled with water
Water
A water-filled trench around a castle is known as a "moat."
A Mote
a moat
a moat
a moat
a moat
a moat
Windsor Castle did have a ditch (moat) up until Charles II had it filled in in the 1700s.The moat was never filled with water though, as the castle is built upon chalk. Any water would have sunk straight through.
Moat refers to a ditch filled with water, often used to help protect a fort or castle. Therefore, a suitable sentence would be "In medieval times, one defence often employed to deter attack upon a castle was the excavation of a deep moat."
It is called a moat
It's called a moat, and it is usually filled with water.