|Native to||United States|
|Region||Alaska (middle Yukon River, Koyukuk River)|
|Ethnicity||160 Upper Kuskokwim (2007)|
|Latin (Northern Athabaskan alphabet)|
Official language in
Upper Kuskokwim is classified as Critically Endangered by the UNESCO Atlas of the World's Languages in Danger
The Upper Kuskokwim language (also called Kolchan or Goltsan or Dinak'i) is an Athabaskan language of the Na-Dené language family. It is spoken by the Upper Kuskokwim people in the Upper Kuskokwim River villages of Nikolai, Telida, and McGrath, Alaska. About 40 of a total of 160 Upper Kuskokwim people (Dichinanek’ Hwt’ana) still speak the language.
A practical orthography of the language was established by Raymond Collins, who in 1964 began linguistic work at Nikolai.
Since 1990s, the language has also been documented by a Russian linguist Andrej Kibrik.