'-- Flow', 1988 hit for Enya (7)
I believe the answer is:
orinoco
(Other definitions for orinoco that I've seen before include "Venezuelan river; one of Wombles" , "Great river in the north of S America, flows through Venezuela" , "River of South America" , "O, I croon about the river" , "Womble; S. Amer. river" .)