as in tributary
the beginning part of a stream
the first exploration of the Missouri River from its mouth to its headwaters was made by Meriwether Lewis and William Clark in the early 1800s
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“Headwaters.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/headwaters. Accessed 24 Apr. 2024.
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