moat

as in ditch
a deep, wide excavation that is usually filled with water and that goes around the walls of a place (such as a castle) to protect it from being attacked

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“Moat.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/moat. Accessed 27 Apr. 2024.

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