watercourses

plural of watercourse
as in canals
an open man-made passageway for water the Erie Canal was the first watercourse to connect the Hudson River with the Great Lakes

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“Watercourses.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/watercourses. Accessed 1 Feb. 2023.

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