Water Moats 水堀

Earlier castles were mostly mountaintop castles so they rarely had water filled moats. With the evolution of hilltop and flatland castles, water filled moats became more common. Water moats often connected with nearby wetlands, lakes, or the ocean to fill with water. During peaceful times, these waterways could also be used for commerce and transportation. Even in later day flatland castles with other water moats, the inner moats were sometimes dry moats. Dry moats are actually a stronger defense than water moats. With water moats, an attacker could hide in the water, swim across and even jump into the moat if pursued.
Water Moats
Edo Castle Nagoya Castle Matsumoto Castle Shirakawa Castle Takashima Castle
 

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