A moat is deep, broad trench, usually filled with water, that surrounds a structure, installation, or town, normally to provide it with a preliminary line of defense.
Forbidden City Tokyo Imperial Palace Drawbridge Angkor Wat Rocca Sanvitale Parkin Archeological State Park Tierpark Hagenbeck Ightham Mote Carl Hagenbeck Moot hill Caerlaverock Castle Matsumoto Castle Ha-ha MOX fuel Corps de logis Mining (military) Vaux-le-Vicomte Siege tower Catawba Nuclear Station Château de Chambord Battering ram Japanese castle National Audubon Society Trench Vellore Mississippian culture Defensive wall Motte-and-bailey Defense (military) Chiang Mai Château Turret Eye (cyclone) Armoured fighting vehicle Xi'an Manor house Nagano Prefecture Ferrara Middle English Gaza Strip