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Confederated Tribes of the Umatilla Indian Reservation, is a stand alone article, but I am not sure what links to it that may affect it ambiguity. So I left it in, and put a {{help}} tag here. Suijur, sui juris 02:44, 12 January 2019 (UTC)Reply

I'm not entirely sure what the question is. If you wonder why the Confederated Tribes of the Umatilla Indian Reservation article is listed on the disambiguation page: Because people interested in that article might reasonably search for "Umatilla" if they don't remember the full formal name, which will bring them here. There don't seem to be any incoming links to this page that need disambiguation. Huon (talk) 03:27, 12 January 2019 (UTC)Reply