Umatilla-Tenino, also known as Columbia River Sahaptin, is a Penutian language of the Western Plateau.
It is spoken natively by only a few dozen elders there, but some younger people are working to keep their ancestral language alive. Some linguists consider Umatilla-Tenino to
be one dialect of a single Sahaptin language, and others consider it to be
one of three or four distinct Sahaptin languages. Umatilla and Tenino speakers have some difficulty understanding
Walla Walla or
speakers, but they are similar enough that speakers can usually all communicate relatively well.