Wintu /wɪnˈtuː/ is an extinct Wintuan language which was spoken by the Wintu people of Northern California.It was the northernmost member of the Wintun family of languages.The Wintuan family of languages was spoken in the Sacramento River Valley and in adjacent areas up to the Carquinez Strait of San Francisco Bay.Wintun is a branch of the hypothetical Penutian language phylum or stock of languages of western North America, more closely related to four other families of Penutian languages spoken in California: Maiduan, Miwokan, Yokuts, and Costanoan.