Tahltan is a poorly documented Northern Athabaskan language historically spoken by the Tahltan people (also "Nahanni") who live in northern British Columbia around Telegraph Creek, Dease Lake, and Iskut. Tahltan is a critically endangered language. Several linguists classify Tahltan as a dialect of the same language as Tagish and Kaska (Krauss and Golla 1981, Mithun 1999).