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 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 Lindley and other scientists said in a 2007 report that wildfires in the headwaters of Mill and Deer creeks, as well as Butte Creek, pose a significant threat to spring-run Chinook. Ian James, Los Angeles Times, 6 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 Nov. 2024.

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