Patwin (Patween) is a critically endangered Wintuan language of Northern California. As of 2003, there was "at least one first language speaker of Patwin." As of 2010, Patwin language classes were taught at the Yocha Dehe Wintun Nation (formerly Rumsey Rancheria) tribal school (Dubin 2010). Patwin has two (excl. Southern Patwin) or three (incl. Southern Patwin) dialects: "River Patwin (or Valley Patwin) was traditionally spoken along the Sacramento River in Colusa County ... Hill Patwin, was spoken in the plains and foothills to the west."