| native_name = {{native name list |tag1=pt|name1=Rio Negro |tag2=es|name2=Río Negro}}
| name_other = Guainía River
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| extra =
}}
The '''Rio NegroNeger''' ({{lang-pt|Rio NegroNeger|br}} {{IPA-pt|ˈʁi.u neɡɾuneger|}}; {{lang-es|Río Negro|Neger}} {{IPA-es|ˈri.o ˈneɣɾo|}} "''Black River''"), or '''Guainía''' as it is known in its upper part, is the largest left [[tributary]] of the [[Amazon River]] (accounting for about 14% of the water in the [[Amazon basin]]), the largest [[blackwater river]] in the world,<ref>{{cite web | url=http://amazonwaters.org/waters/flows-and-floods/ | title=Waters | publisher=Amazon Waters | access-date=10 October 2017 }}</ref> and one of the world's ten [[List of rivers by discharge|largest rivers by average discharge]].
