The result was no consensus. As concerns the mass nomination, which is controversial. These articles can still be renominated individually. Sandstein 21:30, 4 February 2020 (UTC)
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This is a very small waterway in a sparsely populated area of Brazil. Maps (including the one cited in the article) are the only references to the river's existence that I have been able to find, and WP:NFEAT suggests that this is not sufficient to establish notability. Given that there is a highly significant Juruá River (also in Brazil) with its own article, I think that this little creek may be better covered by a hatnote there than by this stub. — jameslucas ▄▄▄ ▄ ▄▄▄ ▄▄▄ ▄ 22:25, 21 January 2020 (UTC)
Update: Based on the feedback received thusfar, I'm expanding this proposal to include the following rivers which have a similar level of significance and article development. I have tried to review each with the care any article deserves (and perhaps especially because there are some articles in the List of rivers of Rondônia that are clearly worthy of retention), but I invite review. Generally I excluded any article with content beyond mention of a park/forest/preserve that overlaps with the watershed. — jameslucas ▄▄▄ ▄ ▄▄▄ ▄▄▄ ▄ 03:28, 30 January 2020 (UTC)