Wintu-Nomlaki was originally spoken in the northern half of the Sacramento Valley, on the upper Sacramento River below Mt. Shasta, and in the upper drainage of the Trinity River and on Hayfork Creek in Trinity County. There were two major dialects, Nomlaki, spoken along the Sacramento River south of Red Bluff, and Wintu, spoken elsewhere in the territory. There appears to have been no significant difference between the variety of Wintu spoken in the Trinity-Hayfork area and the Sacramento Valley variety.