as in tributary
usually headwaters plural 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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Recent Examples of headwater The Four-Star resort is in the headwaters of the Florida Everglades, and the course is a certified Audubon Cooperative Sanctuary, meaning the egret-spotting and heron-watching are spectacular. Katie Sweeney, Forbes, 8 Oct. 2024 The state’s breathtaking scenic landscape boasts natural hot springs, the headwaters of seven major rivers, many peaceful lakes and reservoirs, 12 national parks and monuments, 26 scenic and historic byways, and 58 mountain peaks that top 14,000 feet. Outside Online, 20 Sep. 2024 More:Here's when Michigan's fall colors are predicted to peak Minnesota's Mississippi headwaters Minnesota offers a variety of natural wonders to explore. Jenna Prestininzi, Detroit Free Press, 23 Sep. 2024 The clinic sits next to the Nile, near its headwaters. Ben McGrath, The New Yorker, 19 Aug. 2024 See all Example Sentences for headwater 

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“Headwater.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/headwater. Accessed 21 Dec. 2024.

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