Enter a clue or pattern or both:
The Clue
River's upper tributaries (10 letter answer)
The Answer
HEADWATERS
Tags
Notes
The answer HEADWATERS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Lake Victoria, e.g.
Definition
HEADWATERS as a noun:
1. the source of a river; "the headwaters of the Nile"