Crossword Genius

Its tributaries are Blue and White (4)

Ross

I believe the answer is:

nile

(Other definitions for nile that I've seen before include "long-distance runner in Africa" , "African river" , "Green" , "eastern flower" , "Line (anag)" .)

I've seen this clue in The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.