sentence: Moats are deep, wide ditches filled with water.
sentences_after: They were usually built near sources of water that flowed into the moats, filling them with water. The moats were filled with water for a few reasons. It made enemies swimming across the moat easy targets. It also made it impossible for enemies to dig underneath the castle walls, which was a common method of attack. It also prevented fires from destroying the castle.
concept_name: moat
headings: Moat
categories: Castles