Congo or Amazon (5)

I believe the answer is:

river

'congo or amazon' is the definition.
(I know that Congo River is a river)

This is the entire clue.

(Other definitions for river that I've seen before include "Exe, Po" , "Eg, the Rhine" , "Eg, Amazon" , "Thames is one" , "Natural flow of water" .)

I've seen this clue in the USA Today.

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