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.
Water moats
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Water moats# QUERY9ab60c318caa0e9f5fbcce336102d1c1
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