Crossword Genius

US-Canada border river (7)

Ross

I believe the answer is:

niagara

(Other definitions for niagara that I've seen before include "A lot of falling water" , "River linking Lakes Ontario and Erie" , "River forming part of US-Canada border" , "Waterfall at Iran aga" , "River flowing from Lake Erie into Lake Ontario" .)

I've seen this clue in The Times.
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