Its tributaries have colorful names (4)
I believe the answer is:
nile
(Other definitions for nile that I've seen before include "River at Luxor" , "Green" , "River of eastern Africa" , "white flower?" , "long-distance runner in Africa" .)
I believe the answer is:
nile
(Other definitions for nile that I've seen before include "River at Luxor" , "Green" , "River of eastern Africa" , "white flower?" , "long-distance runner in Africa" .)