headstream

1. A stream that forms the source of a river (synset 109325033)
   is a type of: stream, watercourse - a natural body of running water flowing on or under the earth
   specific instances:

   • blue nile - a headstream of the Nile; joins the White Nile at Khartoum to form the Nile
   • white nile - a headstream of the Nile; joins the Blue Nile at Khartoum to form the Nile

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