Moat
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A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some place
Moat at Beaumaris Castle, Wales
North view of the fortress of Buhen in Ancient Egypt.
A medieval moat castle in Steinfurt, Germany
The 17th-century fortified town of Naarden, Netherlands, showing bastions projecting into the wet moat
Defensive wall
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A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fo
9th century BC relief of an Assyrian attack on a walled town
The lakeside wall of the Yueyang Tower, Yuan dynasty
Medieval defensive walls and towers in Szprotawa, Poland, made of field stone and bog iron
Dangjin-myeoncheon-eupseong (唐津沔川邑城)