Crossword Genius

Its basin covers roughly 40% of South America (6)

Ross

I believe the answer is:

amazon

(Other definitions for amazon that I've seen before include "tropical fish swimming here" , "Great river of S America, or a tough woman" , "One of a mythic nation of women warriors" , "River in South America" , "Net giant" .)

I've seen this clue in The New York Times.
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