headwaters

[hed-waw-terz, -wot-erz]
plural noun
Sometimes, headwater. the upper tributaries of a river.

Origin:
1525–35; head + waters, plural of water

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World English Dictionary
headwaters (ˈhɛdˌwɔːtəz)
 
pl n
the tributary streams of a river in the area in which it rises; headstreams

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Glacier's water can be considered the headwaters of the entire continent.
The headwaters are unimpaired, with the exception of a number of reservoirs.
Reaching the headwaters, the soldiers disembarked and marched either along the
  river or on the canyon rim overlooking it.
Determine whether your watershed is a headwaters watershed or whether other
  watersheds are present upstream of your watershed.
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