Its tributaries are Blue and White (4)
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 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)" .)