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While, yes Bermicourt, I totally agree how dumb "Koatse River is a stream" sounds, it's the common name in every reference. If there is an MOS for rivers that over-rides WP:COMMONNAME, link it to me so I can do better in the future. You asked for a document, and there is Official Standard Names Gazetter for Guyana (US Board of Geographic Names) See page 94. Thus, I've reverted your edit. However, you are more than free to restructure the sentence in a way to remove the repetition. Cheers, Estheim (talk) 20:51, 20 December 2020 (UTC)[reply]
I'm not that fussed and WP:NCRIVER does speak about common usage anyway. It's just that I've come across articles where 'River' is added for disambiguation purposes only (which is deprecated in the guidance) or just because editors are familiar with that naming convention in their own experience. In fact many countries just use the name, referring to "the Weser" etc and that is good enough as the article name. Bermicourt (talk) 22:41, 20 December 2020 (UTC)[reply]