The Koyukon (Coyukon), including the Kolchan-Teneyna, both Athapaskan-speaking groups, live in the Yukon River basin south of the mouth of the Tanana River in central Alaska. There are about five hundred Koyukon speakers living in communities in their traditional area.
Clark, Annette McFadyen (1981). "Koyukon." In Handbook of North American Indians. Vol. 6, Subarctic, edited by June Helm, 582-601. Washington, D.C.: Smithsonian Institution.